I don't know that i've ever seen actual snow tires for it. However, some people make 'snow chains' for their tires. You can use small chain from the hardware store. Probably just a little trial and error to get something that works. I have also seen where people put screws through the tire from the inside for running on ice. That should work pretty good.

I bought a set of MOAB tires for my MT2. I have not even run them yet. But they are a very meaty tire and should do pretty good in snow. Check them out at Towers here:

http://www2.towerhobbies.com/cgi-bin...&I=LXLDK4&P=ML

I think they are popular with crawlers.