Sven is a fictional character who most prominently appears in the animated film "Frozen" (2013) and its sequel, "Frozen II" (2019), produced by Walt Disney Animation Studios. He is a reindeer that lives together with his companion, Kristoff. Sven, alongside Kristoff, assists princess Anna in her search for her sister, queen Elsa, who has run away after placing the kingdom of Arendelle under an eternal winter. During their adventure, Sven also meets and befriends a living snowman, Olaf. Years after the events from the first film, Sven and the others go in search of a mysterious voice heard by Elsa. In the course of the journey, Sven meets other reindeer. Besides the two films, Sven is also present in the short film "Frozen Fever" (2015) and the featurette Olaf's Frozen Adventure (2017).

Sven is a non-speaking reindeer, who has been a companion to Kristoff since both were young. Kristoff understands what Sven communicates through his facial expressions and movements, and he sometimes voices Sven's thoughts. The two of them work together harvesting ice at the beginning of the film, with Sven pulling the sled that carries the ice

More Info: en.wikipedia.org