Kristoff primarily harvests and sells ice in Disney’s Frozen.
Kristoff is introduced as an ice harvester working in the mountains with his reindeer companion, Sven. He cuts blocks from frozen waterways and transports them for trade. This occupation explains why he is familiar with the snowy wilderness and why Anna seeks his help after leaving Arendelle.
The film establishes Kristoff’s trade during the opening ice-harvesting sequence. The workers use saws and other tools to separate large pieces of ice, then move them across the snow. The sequence also introduces young Kristoff and Sven before the main story jumps forward.
The detail is easy to confuse with firewood because Kristoff is a rugged mountain worker and travels with equipment. However, ice is his stated business. His trade also creates a visual contrast with the royal world of Arendelle: he works outdoors and sells a natural resource while the kingdom depends on commerce and seasonal festivities.