Place the clams on a baking sheet and bake for 10-12 minutes, or until the clams are cooked through. If you’re baking the clams, preheat the oven to 350 degrees Fahrenheit. Cover and steam for 3-5 minutes, or until the clams are cooked through. To steam frozen stuffed clams, place them in a steamer basket over boiling water. If you’re looking to cook them, you can either steam or bake the clams. If you’re planning to eat them raw, simply defrost the clams in the refrigerator for 24 hours before eating. So, how long should you cook frozen stuffed clams? It depends on how you want to prepare them. While fresh and canned clams are typically cooked before eating, frozen clams can be eaten raw or cooked. Clams can be enjoyed fresh, canned, or frozen, and each has its own unique flavor. When it comes to seafood, there are few things more delicious than a nice, plump clam.