Freezing mango involves three main steps. First, wash and peel the mangoes, freeze, then slice them to your desired thickness. Second, arrange the slices in a single layer on a baking tray and place them in the freezer for at least two hours. Then get them out to chop in dices to your desired dimensions; finally, transfer the frozen mango dices into an airtight container or freezer bag and store them in the freezer until ready to use.