Make cake circles. Prepare cake batter following recipe directions. Bake and cool cake according to pan package directions. Use knife to trim cake to 1/2 in. high. Use smallest round 1 3/4 in. cookie cutter from set to cut three cake rounds for each treat.
Make whipped topping. If using mix, prepare whipped topping according to package directions.
Prepare strawberries. Reserve several whole berries for garnish. Use knife to slice remaining strawberries into small pieces.
Assemble treat pops. Place cake circle in treat pops container. Add a layer of cut strawberries. Use tip 12 and whipped topping to pipe swirl from back edge following the curve of the container then filling in the center. Repeat layering cake, strawberry pieces and topping one more time. Finish layering with cake and topping. Position whole strawberry on top.