Frozen cranberries are alike fresh cranberries. They are covered with sugar-water syrup sometimes. To make Frozen cranberries at home follow simple method. Clean the fresh cranberries, pack into containers and seal the pack. Put it in deep freezer. Sugar syrup can also be added to this pack to act as an added preservative. Cranberries contain bacteria-blocking compounds that are believed to be helpful in preventing urinary tract infections, and scientists now think this same function may be useful in blocking the bacteria responsible for ulcers and certain oral bacteria that can lead to gum disease.