Place strawberries and syrup in a blender; process 20 seconds.
Place jelly in a custard cup; microwave at HIGH 25 seconds. Stir into strawberry puree.
Spoon 1/3 cup frozen yogurt into each serving dish. Drizzle each serving with 5 tablespoons sauce, and top evenly with peaches and raspberries. Dollop each with 2 tablespoons whipped topping. Serve immediately.