Exactly. Even the candy WB licensed actually involved a creative process to be authentic to some extent.
ICE MICE - "Little candy mice frozen in berry-mint-flavor ice cube candies!"
ACID POPS - "Developed in the Hogwarts magical laboratory, these sour Acid Pops are sure to cast a spell on you!"
FIZZING WHIZBEES - "Amazingly loud fizzing candy in an assortment of 3 sherbert flavors: Blue Raspberry, Orange, and Strawberry."
BLOOD POPS - "Mysterious and magical Harry Potter lollipops that turn your tongue blood red! Each pack includes 5 spooky Blood Pops with a fabulous STRAWBERRY flavor."
DROOBLES BEST BLOWING GUM - "Mysterious Droobles cotton candy bubble gum that turns your mouth blue! This soft and fluffy cotton candy looks like regular cotton candy, but as you munch on the fluff it becomes a chewy bubble gum.... MAGIC!"
JELLY SLUGS - "Spooky, slithering slugs.... make a tasty treat!"
COCKROACH CLUSTERS - "Have you ever seen a giant cockroach scurry across the floor? Stomped on the poor creatures as they tried to flee to their dark lair? Now these delectable critters want to lay eggs and nest in your mouth! Dare to eat a sweet tasty “bug” treat from the world of Harry Potter! The juicy gummy underbelly is covered with a crunchy candy shell, just like real cockroach wings. Even the underbelly of these candy creatures looks real."
Source : :
http://www.candywarehouse.com/harrypotter.html