If you are storing them in a deep freezer you will want to place them on a cookie sheet lined with parchment paper. You will also want to place parchment paper between them to prevent them from freezing together.
If storing in a fridge/freezer combo, they can still freeze together but will often freeze to the wire rack so you can’t get them out of the freezer. To prevent this, place on cookie sheet lined with parchment paper.
Freeze them upright so they will fit in your crockpot without needing to be thawed first.