Yes, whoopie pies can be frozen for later. Once the whoopie pies are completely cooled, wrap them individually in plastic wrap and then place them in an airtight container or freezer bag. You can store them in the freezer for up to three months. When you're ready to eat them, simply remove them from the freezer and let them thaw at room temperature for a few hours. If you're in a hurry, you can also defrost them in the microwave for a few seconds. However, be careful not to overheat them or they may become tough. It's important to note that whoopie pies with a cream cheese or whipped cream filling may not freeze as well as those with a buttercream or marshmallow filling. Cream cheese and whipped cream fillings may become watery or separate when frozen, so it's best to avoid freezing whoopie pies with these types of fillings if possible.