Yes, you can! Freezing unbaked meatballs is a convenient way to have ready-to-cook meals on hand. After shaping the meatballs, place them on a baking sheet lined with parchment paper and freeze until solid. This way they won't stick together in their final container. Transfer them to a freezer-safe container or ziplock bag. When you're ready to cook, simply place the frozen meatballs in the oven and adjust the baking time accordingly.