I didn't get the steamed dumplings while I was there because you got so little. The servings were hardly enough to consider a snack.
At the parks you can get ice cream (only the ones from the carts, up to $3.00...ice cream "stores" aren't included), 20oz bottled soft drink, 24oz Desani water, or popcorn.
You can get the same items at the hotels, plus big cookies or Mickey crispy treats (including the chocolate dipped ones).
Depending on the cashier you can sometimes get better items at the hotels. I was able to get a huge chocolate covered choc-chip croissant with a snack credit. I saw somebody else get a huge slice of cheesecake with one, but the next day when I tried to get the cheesecake I was told it only counted as a dessert. I saw a person being told that Haagan Daaz ice cream bars didn't count, but then I saw somebody else get one with a snack credit at another time. I really think the hotel food courts are hit or miss with the snack credits.