The terms Jötunheimr or Jötunheimar refer to either a land or multiple lands respectively in Nordic mythology inhabited by the jötnar.
10th-century picture stone from the Hunnestad Monument that is believed to depict a female jötunn (or gýgr) riding on a wolf with vipers as reins, which has been proposed to be Hyrrokkin.
Thrym's Wedding-feast by W.G. Collingwood
Giant Skrymir and Thor by Louis Huard [fr]
The Wolves Pursuing Sol and Mani
In Norse mythology, Skírnir is the god Freyr's messenger and vassal. He appears in both the Poetic and Prose Eddas.
An illustration from Fredrik Sander's 1893 Swedish edition of the Poetic Edda