LINE baking sheet with wax paper. Spread 1 teaspoon peanut butter on 20 banana slices. Top with remaining slices. Insert party forks into each bite. Place on prepared baking sheet. Freeze 1 hour.
MICROWAVE chocolate chips in medium microwave-safe bowl on HIGH 1 1/2 minutes. Stir until smooth. Dip each bite into chocolate, coating completely. Sprinkle immediately with coconut, if desired.