Personally, I doubt it. Sharpteeth are pretty big in comparison, and regardless of how weird the tar monster looks, I'd be surprised if it scared one away... :blink:
I recall thinking that the domeheads (pachycephalasaurus, right? spelling aside...) were carnivorous when I was little, but pachys are herbivores, as far as I know. Looking back, I thought it was weird that they'd use leafeaters to pick on a leafeater (aggressively, as if they were gonna attack or eat her)...unless there's something about pachys I don't know.
Sorry for going down the rabbit-hole.