Preheat the oven according to package directions on the crescent dough. Unroll and separate all of the dough triangles. Put the meatballs in the microwave for 1 minute to thaw. Spread a strip of spaghetti sauce along the shortest side of the triangle, sprinkle with Parmesan cheese and place 2-3 meatballs on top. Roll up starting at the shortest side of the triangle. Place rolls on a parchment-lined or nonstick baking sheet and bake according to crescent roll instructions.