Allow the pancakes to cool completely. Then place them on a baking sheet lined with parchment paper in one layer and freeze them for 1-2 hours. Stack and place in a freezer safe container. You can also place a piece of parchment paper between each pancake and freeze. While you could freeze them in a stack without paper, they will freeze together in a big clump. They will keep well in the freezer for 2-3 months or longer. Reheat them in the oven, toaster oven, microwave, or toaster.