Line a 9x9 or 8x8 square pan with foil, with ends of foil extending over sides. Arrange the graham crackers to cover the bottom of the pan.
Pulse fruits in a food processor or blender just until blended. (Some chunks can remain.)
Mix fruit with yogurt and whipped topping in a medium bowl.
Spread over graham pieces in prepared pan. Top with remaining graham crackers.
Freeze at least 4 hours better overnight.
Use foil handles to remove dessert from pan.
Let stand 5 min. Before serving.