How to Freeze Mangoes
To freeze a whole mango, start by peeling it, since this will be easier than trying to peel it once it's frozen. Then, place it in an airtight plastic bag in the freezer. If you've already cut your mango, spread the pieces on a sheet pan or casserole dish and place it in the freezer for 3-5 hours. Once your mango cubes feel firm, take them out of the freezer and use a spatula to scrape them off the bottom. If the cubes are stuck, run your spatula under warm water to help lift them off. When you've loosened all of the mango pieces, transfer them to an airtight sealable bag and put them back in the freezer. Make sure to use them within 10 months while they're still good to eat.
Select ripe mangoes to use. Gently put a very small amount of pressure on them to ensure the hardness of the fruit. Use your touch sense when comparing ripeness, not the color of it. Prepare the mangoes. Use a knife to remove the skin from the fruit. Slice the mango into bite-sized pieces. Place the pieces on a baking sheet. Make sure that the pieces do not touch each other, as it's very difficult to break frozen mangoes apart. It's useful if the sheet has a "lip" or curved section so that the pieces don't fall off. You can always use a shallow casserole dish as a substitute. Place the baking sheet in the freezer on a flat surface. Freeze the fruit for about three to five hours, depending on the thickness of the pieces. Add the frozen mangoes to a freezer zipped bag. Label accordingly, with the current date. Freeze the mangoes up to 10 months.  Combine a cup of sugar and two cups of water in a medium pot.  Bring the mixture to a boil, stirring constantly and allowing the sugar to dissolve.  Allow the mixture to completely cool on the side.  Add the mango pieces in freezer-friendly Tupperware containers. Label accordingly, with the current date. Pour the simple syrup over the mango. Leave a 1" (2.54 cm) room at the top for expansion. Freeze the mangoes up to 12 months.  
Select ripe mangoes to use. Prepare the mangoes. Place the pieces on a baking sheet. Place the baking sheet in the freezer on a flat surface. Add the frozen mangoes to a freezer zipped bag. Freeze the mangoes up to 10 months. Combine a cup of sugar and two cups of water in a medium pot. Bring the mixture to a boil, stirring constantly and allowing the sugar to dissolve. Allow the mixture to completely cool on the side. Add the mango pieces in freezer-friendly Tupperware containers. Pour the simple syrup over the mango. Freeze the mangoes up to 12 months. 