Admiral and Gerry have run skis on the front for goofy experiments but with limited success with stock tires.
Those of us with ATV rear tires typically do better in snow, but snow depth and consistency seem to be the deciding factors more than equipment.
Lowering you stock tire's air pressure can help. While squirrely and unsafe for anything other than first gear crawling speeds I have run as low as 4 psi to climb out of a canyon I had no business descending into.
Sometimes one can get tricked by changing snow conditions from frosty icy mornings to sun softened afternoons.