I would not suggest rolling the hide. Fur out, put the tail inside and pelt inside a bag. It will thaw out better if layed out flat.
If you were going to have it the freezer a long time I would say roll it.
I've put a lot of them in the freezer wet so I don't see a problem there. When you finally get it fleshed if the fur is still wet put it on the board fur out for a few hours to dry the fur. Then stretch it fur in.