Nisser

Nisser (singular Nisse) are little people in Norse Mythology. They are also called Tomtar, Tomtarna, Hobs and/or Brownies.

History
In Norse Mythology, Nisser were almost always depicted as little men with white beards and conical hats, much like garden gnomes. They were sometimes seen as farmers who cleared the forest so people build can build their farms.

The Ship of the Dead
Hearthstone reveals that hundreds of Nisser used to live in the woods behind his mansion. But his father, Alderman, called the exterminator to get rid of them all. Magnus Chase used the tunnels they made to kill Alderman when he turned into a dragon.

Trivia

 * In many fairy tales, Nisser has often been mistranslated as goblins.