Heat oven to 350°F. In medium bowl, knead cookie dough balls together with cocoa until blended. Divide dough into 12 pieces; roll each into ball. On ungreased cookie sheet, place balls 2 inches apart; flatten slightly to make smooth tops. Use fingers to press dough inward at top of each cookie, forming 2 V-shaped ears.
Bake as directed on package. While cookies are baking, plan and assemble decorations. Immediately decorate hot cookies with candy-coated chocolate candies for eyes, candy corn for noses and string licorice for whiskers. Remove cookies from cookie sheet to cooling rack. Store cooled cookies tightly covered.