Yes, freezing pineapple is a great way to preserve it for later use in smoothies, desserts, or cooking. First, it's best to flash-freeze it by arranging the pineapple pieces in a single layer on a baking sheet lined with parchment paper. Make sure the pieces do not touch each other to prevent them from sticking together. Place the baking sheet in the freezer and freeze the pineapple pieces for 2-4 hours, or until they are solid. This flash-freezing method helps keep the pineapple pieces separate, making it easier to use just the amount you need later. Once the pineapple pieces are frozen solid, transfer them to an airtight freezer bag or container. Squeeze out as much air as possible before sealing to prevent freezer burn. Label the bag or container with the date and type of fruit. Store the frozen pineapple in the freezer for up to 6 months.