Yes! Place the bao on a plate or flat dish so they are not touching on each other. Freeze until the bao are no longer tacky to the touch. Place all of the bao in a large zip-top bag, remove the air, and freeze. When you're ready to reheat, remove as many bao as you want and either (1) steam the bao again until warmed, or (2) wrap the bao in a damp paper towel, and microwave until warmed through.