The most commonly mentioned one is Tigger Tails (Marshmallow Wand with Orange-Colored Sugar), available at Pooh's Corner in Critter Country. There are also Mickey-shaped beignet at the Mint Julep Bar in New Orleans Square, along with the (non-alcoholic) Mint Julep.
I think there are a fair amount of unique presentation for treats at DLR, but there are probably items at are similar at WDW. For example, I mentioned the Mickey beignets; PORFQ has beignets too, but they're not Mickey-shaped. Ditto for the Tigger Tails...they sell marshallow wands at WDW too, but they don't look like Tigger Tails.
Another "unique" treat to DLR are the freshly made candies (e.g., nuttles, peanut brittle, fudgmallows, English toffee, etc.) that they make at the Candy Palace on Main Street.