Spray the insides of six 3-ounce paper cups with cooking spray. Pulse the cereal and coconut in a food processor until coarsely ground.
Put about 1 tablespoon cereal mixture in the bottom of each cup and top with 1 tablespoon frozen yogurt. Add 2 tablespoons sorbet and press into the cup, then pack in another tablespoon of frozen yogurt and sprinkle with more cereal mixture. Insert a wooden stick into the center of each pop and freeze until hard, at least 4 hours.
Before serving, snip the paper cup and peel it off.
For extra crunch, roll the pops in more crushed cereal after you unmold them.