I've had good results with freezing pizza dough - I simply roll it out to the size I want, add some tomato (say pasta) sauce, chopped fresh onion, mushrooms, peppers etc, slices of mozzarella cheese and then cover with cling film and freeze. When I want to cook the pizza, I simply remove from the freezer and pop into a COLD oven and turn the heat up to 200 deg C. In other words it goes into an unheated oven which gradually heats up both oven and pizza and as the heat penetrates the yeast dough, it rises up again. You really do need to pop your frozen uncooked pizza into a non-preheated oven though, or this won't work !