In real life, someone can start a candy business called Honeydukes as long as they do not infringe on any existing trademarks or copyrights. However, as far as I know, there is no real-life business called Honeydukes that is officially affiliated with the Harry Potter franchise. There are some candy stores that have been inspired by Honeydukes and sell Harry Potter-themed candies, but they are not officially licensed by the franchise.
Wrong, there is a Honeydukes in Universal Orlando Resort.
