Instructions. Divide the whipped cream mixture into 3 parts, so you can have a 3-layer mango float. To assemble the mango float, first you have to arrange graham crackers in your baking dish. Lay the crackers flat and even until you cover the whole bottom of the pan. Use scissors or sharp knife to trim the crackers, if needed.
Arrange the thinly sliced mango decoratively on top. Sprinkle crushed graham crackers around the edge of the float. Cover the mango float in plastic wrap and refrigerate for 4–6 hours, until the cream sets and the graham crackers soften and absorb some moisture. Transfer the float to the freezer for 8 hours, or overnight.
Peel the mangoes and cut the lobes off as close to the pit as possible. Thinly slice half of the mango lobes into ¹⁄₁₆-inch (15 mm)-thick slices, keeping the slices intact and transferring to a tray or plate. Cover and refrigerate until ready to assemble. Cut the remaining mango into ½-inch (1.24 cm) cubes.