Hi. I like your orc but in my opinion you should get rid of these flowers, they ruining it. I also like the design and the palette of the flying guy.
About the pot : I can't understand what happens with, it neither what's coming out of it.
The hippo seems really flat, maybe you should add some pixels on the top of the head and above the eye. I think the two pixels of the tooth should remain horizontal when the mouth is open. Also, the red color of the eye doesn't match, it's too vibrant.
In general, a two frames animation seems really not enough to make it smooth.