A troll doll is a type of plastic doll with furry up-combed hair depicting a troll, also known as a Dam doll after their creator Danish woodcutter Thomas Dam. The inspiration came from trolls in old Scandinavian folklore. The toys are also known as good luck trolls.

A troll is a being in Nordic folklore, including Norse mythology. In Old Norse sources, beings described as trolls dwell in isolated areas of rocks, mountains, or caves, live together in small family units, and are rarely helpful to human beings.