Great animation, as usual from you

Minor stuff, if you've got the time and interest:
On the walking anim, the head seems to pop around too much, i'd try to make it smoother (maybe simulate some subpixel movement, reptiles tend to be very fluid on their movement). Maybe make the head move one frame later than the body, to simulate some bouncyness and dampening of the body movement (as any creature moves, the body tries to dampen the shocks and bumps from the floor, so that it doesn't get headaches with jittery movement

).
On the jumping anim, it looks nice. I'd suggest on the frame where he's falling to the ground, stretching the lizard (with some deformation) to show the speed of the movement.