This is a character from the next generation of Avengers, I'm not sure what his real name was tho. He gains his powers from a fossil/gem that his archeologist parents gave him at a dig, it allows him to change any or multiple parts of his body into that of a prehistoric creature.

Recipe:
Head/Spine- McFarlane Horrid (Spawn: dark ages)
Base- DCD Aquaman(Arthur J Curry)
Forearms- MS Venom
Hands- McFarlane Dragon
Legs- ML Annialus