Prepare Mangoes: Peel, pit, and slice 3 ripe mangoes into thin strips. Set aside.
Whip Cream: In a mixing bowl, whip 2 cups heavy cream until soft peaks form.
Add Condensed Milk: Fold in 1 can (14 oz) sweetened condensed milk and mix until smooth.
Layer Graham Crackers: Line the bottom of a baking dish with graham crackers, breaking them if necessary to fit.
Layer Cream & Mango: Spread a layer of whipped cream mixture over the graham crackers, then add a layer of mango slices. Repeat layers.
Chill: Cover with plastic wrap and freeze for at least 4 hours or overnight to set.
Serve: Slice and serve chilled, enjoying the creamy, fruity layers!