Jason lacks any meaningful combat skills, and Muckman is a character I'd rather never see again. XD But maybe the Mutanimals could, with Kurtzman's help, set up some kind of emergency shelter for vulnerable noncombatant mutants, since you know there have to be more out there.
I'd like to see Mondo gecko as mutanimal since he was a member in the original archie comics run on TMNT. Also I agree Gilgameshkun, I rather not have mucman as a member do to him being a jerk and a spotlight stealer.
Even though somebody listed the two of them as members of the Mutanimals, we don't have confirmation if they are actually members of the group. As for Muckman, his status as the Monster Hero is already known. He's not even a mutant animal anyway.