I haven't dealt with refrigerator frozen turnips (because I don't like turnips) but I have had onions, carrots and other relatively hard veggies get accidentally frozen or partially frozen in the refrigerator. I find that if I just throw them in something where they will be well cooked, like a soup or stew, they are fine. You definitely cannot use them in salads or something calling for uncooked fresh vegetables. I figure they are not much different than the frozen vegetables you buy at the grocers so I use them the same.