To cook frozen raw meatballs, you will need to increase the cooking time. Whether you're cooking raw meatballs or reheating pre-cooked meatballs, it's important to check the internal temperature to make sure they're fully cooked. My favorite way to use frozen meatballs is to use frozen Italian meatballs and cook them in my simple San Marazano tomato sauce. If you're working with frozen meatballs that aren't cooked but frozen, you've probably made the meatballs yourself and frozen some for later.
I always have Italian meatballs, Asian meatballs, and Kofta meatballs waiting for me in the freezer for a quick meal.