Heat oven to 350°F. Knead cookie dough and flour together until smooth. Roll out dough to a scant 1/4-inch thickness on a lightly floured surface.
Using a 3-1/2-inch round cookie cutter, cut out as many cookies as possible. Transfer to baking sheets. Cut a 3/4-inch-deep notch, 2 inches long, to make the ears. Repeat process to make more cookies using remaining dough. Bake cookies until golden, 10 minutes. Transfer to a wire rack. Let cool completely.
Cover cookies with chocolate frosting. Place chocolate sprinkles around edge of cookies. Put candy corn on for ears. Cut marshmallows in half, then place on cookies cut side up. Press on M&M's for eyes. Use black tube frosting to pipe slits on M&M's; use orange frosting to create noses. Trim licorice and place on cookies for whiskers.