If you have access to corn husks during the growing season, that is a virtually free snack that you can actually freeze for year-round treats.
I get husks from grocery stores and farm markets. I remove the outer green husks (they may be sprayed with pesticides) and use only the light inner husks. Then I trim top and bottom, tear into strips about 1/2 inch wide, wash well, and lay them out on a cookie sheet in the freezer. Once frozen, I put them in zip-log bags. One year I had 4 gallons which got me through until the next growing season.
Also, if they like watermelon rind, that can be sliced and frozen the same way. Nothing like a watermelon treat in January!