Cover plate with waxed paper. Cut each of 4 marshmallows into 4 lengthwise pieces. Place 2 drops food coloring in small bowl. Dip 1 end of each cut marshmallow, 1 at a time, into food coloring; place on prepared plate. Reserve for later use.

Mix frosting and 1/4 tsp. food coloring until blended. Spread onto flat sides of cookies.

Place 6 of the remaining marshmallows, side-by-side, around front edge of each of 8 cookies; cover with remaining cookies, frosting sides down, pressing back sides of cookies together to resemble mouth as shown in photo.

Press 2 of the reserved marshmallows into each mouth for the fangs.