Several days in advance, make fins: Add 1/2 teaspoon Gum-Tex to 6 oz. fondant. Roll out fondant and using patterns, cut out 1 Tail Fin, 1 Dorsal Fin and 2 Pectoral Fins (reverse pattern for 2nd pectoral fin). Let dry on cornstarch-covered board for 2-3 days. Attach lollipop sticks to underside of fins with thinned fondant adhesive, leaving 2 1/2 in. extended. Let dry.
Bake 2 football cakes using firm-textured batter such as pound cake. Cool.
Assemble cakes, trimming bottom side to sit level if needed.
Mark mouth on cake using Mouth Pattern. Outline and fill in with tip 3, smooth with finger dipped in cornstarch. Mark eye positions using back of tip 1A as size guide. Pipe tip 1A eyeballs, smooth. Pipe tip 3 pupils, flatten slightly. Pipe tip 352 teeth.
Cover body with tip 17 stars. Insert tail fin, dorsal fin and pectoral fins.