You sure can! To freeze unbaked Medialunas, arrange the shaped crescents on a baking sheet and place them in the freezer for 1-2 hours or until they're firm. Transfer the frozen Medialunas to a zip-top freezer bag and store them for up to 1 month. When you're ready to bake, simply arrange the frozen Medialunas on a parchment-lined baking sheet, let them thaw and rise at room temperature for about 2 hours, then bake as directed in the recipe.