Yes, these buns freeze well. Once you've baked the buns, allow them to cool completely, but do not pipe the cross on the top. Wrap them in plastic and then aluminum foil, and freeze for up to a month. When you are ready to serve the buns, thaw them overnight on the counter. You can reheat them in a warm oven or microwave to take off any chill. Let cool and pipe the crosses on top before serving.