Ice Wolf is an anthropomorphic lupine NPC in Undertale that appears in Snowdin. They appear to speak with truncated third-person grammar.

On Neutral Routes, they are located a little eastward of the Slime Family. This character is shown behind a gated area, throwing mass produced, large ice cubes into the stream. This task is done to cool the Core. After completing the True Pacifist Route, they can be spoken to directly. They are mostly happy that they do not have to throw ice anymore so they can take a break to buy some pants. They are also considering changing their name to Jimmy Hotpants.

Ice Wolf also appears in Deltarune but now wears a pink ICE-E shirt and blue pants. They are found in QC's Diner in Hometown. They tell Kris that they don't like drinks containing ice, preferring the ice "to BE drink," but do like ice-themed mascots.

Further reading:

Undertale wiki article
Deltarune wiki article