Yes, the meatballs can be frozen either before or after baking. To freeze before baking, place unbaked meatballs on a baking sheet in the freezer. Once frozen, remove the meatballs and place them in a freezer-safe container or bag. Freeze for up to 3 months. To freeze baked meatballs, place cooled meatballs in a freezer-safe container or bag and place them in freezer for up to 3 months. Meatballs can be frozen with or without the sauce. If frozen with the sauce, the additional sauce may be needed once thawed.