In A Large Skillet, Cook Beef Over Medium Heat Until No Longer Pink; Drain. Remove From The Heat. Add The Tomato Sauce, Mozzarella Cheese And Oregano. Separate Crescent Dough Into Eight Rectangles, Pinching Seams Together. Place About 3 Tablespoons Of Meat Mixture Along One Long Side Of Each Rectangle. Roll Up, Jelly-Roll Style, Starting With A Long Side. Cut Each Roll Into Three Pieces. Place, Seam Side Down, 2 In. Apart On Greased Baking Sheets. Bake At 375