Trolls have long been a part of folklore, but they have recently become a popular topic in the media. This guide will provide an introduction to the culture of trolls, helping readers to understand and appreciate their unique customs and traditions
From Wikipedia
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.