Can Rabbits eat snow?

Depends on where you live, while snow is definitely just frozen water it can also pick up pollution, debris, and bacteria you can't see.

Your rabbit will be fine, I don't believe there are any cases of snow killing a rabbit via consumption but just as with children make sure it's safe for your area, especially if you live near by to any power plants.

I see no reason not, it’s just water at that point, nothing should be able to harm it, just think of it like water