Is a sundae or ice cream cone from Mrs. Potts, for example, considered a snack on DDP? They list ice cream novelties as an example on the Disney website. I'm sure DS will want a few of those, but he is a big hot fudge sundae fanatic, so I know sundaes will be on the menu at some point.
We have a sticky thread at the top of this forum with the confirmed snacks for 2008. These are snacks that other members were able to get with a snack credit.
Just for general information, though - an ice cream novelty would be a Mickey bar, an Itzakadoozie, a frozen banana if Disney still has them... that kind of thing.