Troll dolls were all the rage in the early 90's. I myself had quite a few and honestly still kinda dig them. The Norfin brand of Trolls even got a few direct to video cartoons! Castle of Doom, their Halloween special is something interesting. Some good natured trolls find themselves in a haunted castle pursued by Frankenstein, Dracula, and The Wolfman as trolls. There's a mad scientist too! Look, if I were to tell you there was a Halloween Troll OVA, would you believe me? Good thing I found an upload of the VHS. Ironically, troll dolls are also known as Dam dolls thanks to being created by a dude named Thomas Dam.