Soup- with vegetables, sour cream and half and half..is it possible to freeze that soup?

Yes, just whisk it well once defrosted, because it may separate a bit. I freeze pureed veg soups all the time - in fact, had some defrosted curried cream of broccoli just last pm.

Yes. I freeze my cream of mushroom soup all the time. Just let it defrost slowly in the fridge when you decide to use/eat it.