Preheat oven to 375°. Combine sugar and cinnamon. Dip marshmallows in melted butter; roll in sugar-cinnamon mixture. Wrap a crescent triangle around each, completely covering marshmallow and squeezing edges of dough tightly to seal. Dip in butter. Place in muffin pans. Bake 10 to 15 minutes, until golden brown. Immediately remove from pans.