S.E.
We did that accidentally... Threw box in freezer.
I have also taken reg. yogurt (not sweetened candy style), mixed in fruit, put a slit in plastic lid, and slipped wood craft stick through/into yogurt. Then freeze. When my daughter wanted one (rarely ever....she doesn't like sweet foods.), I warmed the cup under the faucet with hot water and slipped off the cup. She had an instant drip catcher and a healthy treat.
It was too bad that she doesn't like sweet. I'm not complaining. Honest.
S