Yes, you can! To freeze, cut the cabbage into wedges, then blanch the wedges by plunging them into boiling water for two minutes and immediately plunging them into ice water. When the wedges are cool, remove them from the water and shake off excess water, patting dry with paper towels. After that, flash freeze the wedges on a baking pan, then transfer the frozen wedges to freezer bags and seal. Finally, return to the freezer for up to 4 months.