Here's the original black and white cardback art for Terroar that would have appeared on his cardback, during the 1980's line. I beleive this is his cardback art as if shows him attacking Slamurai, a Heroic Ninjor counterpart who would have also been in the line back then.
Making Terroar in Origins wouldn't be hard, as all the parts for him (Whiplash's head, Trapjaw's robotic arm, Rattlor's body, left arm, tail & pelvis and Mosquitor's legs) all exist in Origins already.