Yes, cooked couscous can be frozen for up to 2 - 3 months. Make sure to allow the cooked couscous to cool to room temperature before freezing. If you have a lot left over, you can also divide the cooled couscous into individual or family-sized portions for meal prepping. This makes it easier to thaw only the amount you need. Transfer the portions into airtight containers or heavy-duty freezer bags. Remove as much air as possible to prevent freezer burn. When you're ready to use the frozen couscous, transfer the portion you need to the refrigerator the night before to thaw. You can also reheat it directly from frozen in a microwave or on the stovetop. Make sure to break apart any clumps with a fork as it thaws and heats.