I freeze pancakes all of the time. Even getting a brand name mix is cheaper than buying them premade! When I freeze them, I don't bother stacking them, or putting anything between them. I just keep them in a single layer in a freezer bag, and then lay the bag flat until they are frozen. I know some people will freeze them on a baking tray first, but I don't bother.
I don't have a waffle iron at all, otherwise I would freeze them as well! The pancakes I reheat in the microwave.