Mammoth is the only one I know too. West Yellowstone has a number of snow coach and snowmobile tour operators, but it is also really, really, cold - generally 10-20 degrees colder than Bozeman. We have been there in early January for snow coach tours, but it was -20F overnight. My motorhome is a nice four season one, but I wouldn’t trust it at those temps. Also, the only way you can get into the park is on approved snowcoach and snowmobile tours if you don’t ski in. As Twogypsies noted, the only road in Yellowstone open in the winter is between Gardiner and Cook City because that is the only road access for Cook City in winter.
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