Yes, you can freeze pineapple buns to extend the shelf life. Allow the pineapple buns to cool completely to room temperature. Then, wrap each pineapple bun individually in plastic wrap or aluminum foil. This helps prevent freezer burn and keeps them fresh. After that, put them in a plastic freezer bag. Remember to label the bag with the date you freeze the buns. This will help you keep track of their freshness.