musher

noun4

1. •
   One who drives a dogsled over ice and snow; specifically, one who participates in a dogsled race.

   • A sled dog learns that by the time she's hungry, her musher has already prepared a meal; by the time she's tired, she has a warm bed. — 2020
2. •
   One who travels over snow, chiefly by dogsled but also by foot.
3. •
   (slang) Synonym of mush (“a cab driver who is the owner of their cab, and sometimes a small number of other cabs as well”).

   • Nobody knew Old Joe. He was a "musher"—that is to say, he owned his own cab and mostly did night work. He gave no trouble to anybody, and came and went as a rule in the dark hours of the night. — 1927
4. •
   (dialect) A mushroom.