I didn't notice the human flesh bit. Yeah, that would be a problem on a team of superheroes. And it's not like you couldn't do the Frankenstein thing with a character that looked more human. Frankenstein's monster was mostly humanoid after all. I'm not trying to curb your creativity, but there would realistically be problems with a 4.5 metre lizard that doesn't mind eating human flesh being on the team. That's why a humanoid with lizard features would probably work better here.

EDIT: I have to leave for rifle practice, so we'll finish discussing this when I get back.