I've updated my first post as my final submission
The final art is as follows:
I decided to redraw his leaf appendages larger and more scoop
-like in appearance, making his use of such competitive moves as Fling, Gunk Shot, and Barrage more plausible. Because he didn't have tiny little t-rex leaves anymore I thought I'd make his feet stumpier and lose the whole chickenly sub-theme altogether.
I think your potato has potential, OldMan, but it could develop more appeal, and the toad is already ahead of it in terms of personality.
Legs are cool and all, but I miss old snake-y