The song used to call Elsa to the enchanted forest is a type of Scandinavian herding call called kulning. It was used briefly in the score of the first movie. In Frozen 2, the kulning central to the plot is performed by a Norwegian singer Aurora. The melody used for the kulning is the "dies irae," which, since the 13th-century (or sooner), has referred to the wrath of God's judgment on humanity.
Olaf's statement that turtles can breathe out of their butts is a real phenomenon known as cloacal respiration. It occurs with several species, including painted box turtles, eastern snapping turtles, and Fitzroy river turtles.
Kristoff's song "Lost in the Woods" is done in the style of a 1980s power ballad. The sequence even recreates scenes from well-known videos of that era, including those from the bands Whitesnake and Queen.
The Northuldra tribe's culture is inspired by the Sámi people, who are indigenous to Norway, Sweden, Finland, and northern Russia. Disney signed a formal agreement with Sámi representatives who promoted the group's rights internationally; they formed an advisory group of artists, historians, elders, and political leaders. The Northern Sami language dub is called "Jiknon 2."