Kristoff Bjorgman is a fictional character in Walt Disney Animation Studios' Frozen franchise. He appeared in the animated features Frozen (2013) and Frozen II (2019), and the animated short films Frozen Fever (2015) and Olaf's Frozen Adventure (2017). He is voiced primarily by Jonathan Groff. Kristoff is a Sámi iceman who lives together with his reindeer companion Sven. Albeit preferring a solitary life, he helps Princess Anna of Arendelle to find her older sister Elsa in the North Mountain.