Tricky Treat

The Tricky Treat item increases movement by 20% for 4 seconds, and by 4% for 30 seconds (stackable). You will get an Upset Tummy if you eat too many.

With patch 4.2.0, Tricky Treats are now used as currency, allowing you to purchase various Hallow's End items.

Source
Tricky Treats are earned by completing Hallow's End dailies, found inside the Handful of Treats from each Candy Bucket in inns, and also the Loot-Filled Pumpkin from killing the Headless Horseman. They can also be bought from Izzy Hollyfizzle for. They are also rewarded from Get Spooky.

Wands
2 Tricky Treats can be exchanged for any of the following wands: