Yeah, I had those toy megatheriums too; not sure they still make them. I still remember when I first started playing D&D and saw how the rust monster and bulette were exactly like toys I had from some pack of "dinosaurs." Much later I learned that was really where they came from. That same set had something that looked like an umber hulk crossed with a dragon.
"Could you fancy me as a pirate bold? Or a longship Viking warrior with the old gods on his side? Well, I'm an inshore man and I'm nobody's hero. But I'll make you tight for a windy night and a dark ride."--Jethro Tull