Cut the marshmallows in half widthwise. It's easier to cut the marshmallows if you dip them in confectioners' sugar first, but it's not essential. Carefully pull each cupcake liner partially away from the cake and tuck in a marshmallow half between the paper and the cupcake. Frost each cupcake and marshmallow. Add eyes made from Junior Mints with white frosting dots, a black lace licorice nose, and white Tic Tac teeth.