Tanngrisnir and Tanngnjóstr

Scholars have linked the ever-replenishing goats to the nightly-consumed beast Sæhrímnir in Norse mythology and Scandinavian folk beliefs involving herring bones and witchcraft.

The poem says that this is the fault of Loki, yet that "you have heard this already", and that another, wiser than the poet, could tell the story of how Thor was repaid by a lava-dweller with his children.

[5] A stanza from the Poetic Edda poem Þrymskviða describes Thor's goat-driven ride to Jötunheimr: In chapter 21 of the Prose Edda book Gylfaginning, the enthroned figure of High divulges that the god Thor has two goats that drive his chariot and that these goats bear the names Tanngnjóstr and Tanngrisnir.

The peasant's son Þjálfi takes one of the goat ham-bones and uses a knife to split it open, breaking the bone to get to the marrow.

Third notes that there is no need to draw out the tale, for: At realizing how terrified he has made the peasants, Thor calms down and from them accepted a settlement of their children Þjálfi and Röskva.

[11] Scholar Rudolf Simek connects Tanngrisnir and Tanngnjóstr with the beast Sæhrímnir (consumed nightly by the gods and the einherjar and rejuvenated every day), noting that this may point to sacrificial rites in shamanic practices.

However, in fear that one would waste away if one were fed the same morsel again and again, folk tales describe the breaking of the herring bones when eating it as a form of precaution.

Thematic similarities—bone breaking ending food rejuvenation—between this folk belief and the Old Norse tales of Tanngrisnir and Tanngnjóstr have led scholars Reimund Kvideland and Henning Sehmsdorf to highlight a connection between the two.

[14] In the film adaptation of the Speed Racer manga franchise, there is a racecar named after Tanngrisnir, driven by Gothorm Danneskjøld, who is appropriately dressed as a Viking and sponsored by a company called Thor-Axine, referring to the chariot.

In Rick Riordan's book Magnus Chase and the Gods of Asgard: The Sword of Summer, both Tanngrisnir and Tanngnjóstr appeared.