Frozen Theory, Part 2: According to Chris Buck, director of Frozen, however, they didn't die on that boat. They washed up on the shore of a jungle and the queen later "gave birth to a baby boy" and built "a treehouse" before getting "eaten by a leopard." Sound familiar? That's the beginning of the Disney movie Tarzan. So if this theory is correct, Tarzan is the son of the king and queen of Arendelle and the long-lost brother of Elsa and Anna.