You ever watch a cartoon and think, "Man, that voice is so familiar, but I can't place it"? Honestly, if you’ve spent any time on Disney Channel or Netflix over the last few years, there’s a massive chance you’re hearing Justin Felbinger. He’s not exactly a household name in the way a movie star is, but in the voice acting world? The kid is everywhere.
Most people know him as the energetic, slightly chaotic pink frog Sprig Plantar from Amphibia. But that’s really just the tip of the iceberg when it comes to Justin Felbinger movies and tv shows. From intergalactic adventures to guarding the Pride Lands, he’s built a resume that’s weirdly impressive for someone who basically just started college.
That Frog From Amphibia (and Why He Matters)
Let’s talk about the elephant—or frog—in the room. Sprig Plantar. If you haven't seen Amphibia, it's basically this show about a girl named Anne who gets stuck in a world of talking frogs. Sprig is her best friend, and Felbinger absolutely nails that "high-energy younger brother" vibe.
What's actually wild is that his voice changed during production. Felbinger hit a growth spurt right in the middle of Season 1. His voice started dropping, which is a nightmare for a voice actor playing a kid. The showrunners actually leaned into it, though. In a Season 2 episode, they even made a meta-joke where Anne says some of the characters "even sound different."
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That kind of authenticity is why fans love him. He didn't just play a character; he literally grew up with the show.
Beyond the Swamp: A Look at His Filmography
If you think he's just a one-hit-wonder with Amphibia, you're wrong. Sorta. He’s been working steadily since about 2015, and the range is actually pretty cool.
- Miles from Tomorrowland: This was one of his big early breaks. He took over the lead role of Miles Callisto starting in Season 2. If you have a younger sibling or a toddler, you've probably heard him shouting about "blastastic" space adventures while you were trying to eat breakfast.
- The Lion Guard: He voiced Mtoto, an elephant calf. It’s a small role, but it’s part of the Lion King universe, which is a pretty big deal for any actor’s portfolio.
- The Boss Baby: Back in Business: He plays Danny Petrosky. It's a recurring role on the Netflix series, proving he can do the DreamWorks style just as well as the Disney stuff.
- Infinity Train: He voiced Nate. This show is a cult classic for a reason—it’s dark, weird, and brilliant. Felbinger being part of that "prestige" animation circle says a lot about his talent.
The Movie Side of Things
While he’s mostly a TV guy, Justin has popped up in some interesting film projects too. He played Young Surly in The Nut Job 2: Nutty by Nature.
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He also did voice work for Deep, an underwater adventure movie where he played the title character. It didn't win an Oscar or anything, but it showed he could carry a feature film as the lead. Plus, he’s done a ton of "ADR" (Automated Dialogue Replacement) and loop group work for massive movies like X-Men: Apocalypse and The Maze Runner: The Death Cure. Basically, he’s the "background noise" and extra voices that make those big action scenes feel real.
Why Producers Keep Hiring Him
Voice acting isn't just about making funny sounds. It’s about timing. Felbinger has this specific quality—a mix of raspiness and pure enthusiasm—that makes him perfect for "spunky kid" roles.
He’s even talked in interviews about how he was hesitant to audition for Sprig because his voice felt too hoarse. He actually used some tech to pitch it up for the audition, but the creators liked the natural texture he brought. It felt real.
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A Quick List of Guest Spots You Might Have Missed:
- The Casagrandes: He played a bratty kid named Ralphie.
- Summer Camp Island: He was the voice of Oscar in the original pilot.
- American Dad!: Yeah, he’s even done the adult animation thing.
- Shimmer and Shine: He played Zac, the neighbor.
What’s Next for Justin?
As of early 2026, he’s still very active. There have been rumors and small leaks about him working on new Nickelodeon projects, and he’s a regular at fan conventions like FanX or Streamily.
The coolest thing about his career right now is the shift. He’s no longer just the "kid voice." As he gets older, he's starting to land roles that require a bit more range and maturity.
Pro Tip for Fans: If you want to see what he’s up to in real-time, he’s actually pretty active on social media and occasionally does Cameos. It’s a great way to see the face behind the frog.
If you’re looking to dive into his work, start with Amphibia for the heart, then check out Infinity Train to see a different side of his acting. He’s one of those rare child actors who seems to have transitioned into a professional adult career without all the typical Hollywood drama. Keep an ear out—you’ll probably hear him in the next big animated blockbuster.
To stay updated on his latest credits, keep an eye on his IMDb or follow the official Disney Branded Television press releases, as he frequently collaborates with their animation studios. You can also track his upcoming convention appearances through sites like Comic-Con International to see if he'll be doing any live panels or signings in your city.