Have you tried this method? Wash dirt off tomatoes and wipe dry with paper towels. Put tomatoes in resealable plastic bags, remove excess air, seal and freeze. There is no need to peel the tomatoes as the skins will slip right off if you run them under hot water when you are ready to use them, or you can just let them defrost and slip the skins off. You can place tomatoes on a cookie sheet and freeze them before putting them into the plastic bag. This step can help prevent them from sticking together in the freezer bag.