The troll things with weird hair that makes them look like they are always upside down are just called Troll Dolls. The first trolls of this kind were made in the mid-1960's, and resurfaced again in the early 1990's. AnswerParty!
Scandinavian folklore is the folklore of Norway, Sweden, Denmark, Iceland and the Faroe Islands.
Collecting folklore began when Gustavus Adolphus of Sweden sent out instructions to all of the priests in all of the parishes to collect the folklore of their area in the 1630s. They collected customs, beliefs that were not sanctioned by the church, and other traditional material. Fantasy
The Original Battle Trolls was a brand of action figures produced by Hasbro from 1992-1993. They were made in attempt to market the popular concept of troll dolls to young boys in the early 1990s.
Troll Tales is an animated television show based on the book by Henning Kure. it involves three young trolls called Snapper, Tumbler and Willy Wee.