In advance: Mold candy eyeballs. Let set. Attach eyeball halves using melted candy. Cut small hole in bottom and attach lollipop stick using melted candy.
Bake and cool mini cakes. Attach halves with icing. Trim off leaves and stem for a smooth curve. Ice smooth 1 1/2 x 3 in. wide rounded mouth. Use tip 3 to outline and fill in 1/2 in. long teeth; pat smooth with finger dipped in cornstarch. Pipe tip 6 outline lips; flatten slightly with finger. Cover cake with tip 16 stars. Insert eyeballs.