I’m happy to report that yes, frozen cooked grape leaves can be reheated to their original delicious state! I used to do this for my nephew John, freezing grape leaves in packs of 6 each in a small freezer bag that I could refrigerate and thaw overnight and then put in his lunch. By lunch time they were just right at room temperature! This is how to thaw frozen grape leaves, in the refrigerator overnight, then warm to room temperature or reheat in the microwave or oven, spritzed with water or lemon juice and a drizzle of olive oil to refresh the leaves.