Treeby is a playable character in Frogger 2: Swampy's Revenge. He is a tree frog.
Character Description from Frogger 2: Swampy's Revenge:
Out of his tree and ready to play, Treeby is a nervous, crazy- looking, frog. Happier amongst the branches, he's almost as acrobatic as Frogger and hates water just as much.