Bake Sports Ball cake using firm-textured batter such as pound cake. Cool. Position 2 marshmallows on sides for eyes, attach to cake, securing with icing. Cover with icing, overpipe and smooth with spatula. Using tip 4, pipe whites of eyes, pupils and inside mouth. Smooth with finger dipped in cornstarch. Using tip 6, outline lips. Cover frog with tip 18 stars. Position and insert legs and cover with tip 18 stars.