There really isn't, but...
Most chicken feed contains diatomaceous earth (DE) and probiotics which help with internal parasites.
You can also just feed your chickens probiotics every so often. I ferment grain which they get every other day. They make powders like Hydro-Hen or Sav-A-Chick and several others that you put in their water now and then. Sugar-free yogurt, especially Greek yogurt are high in probiotics too. ACV (apple cider vinegar) preferably with the mother, is also a good probiotic. That you put in their water 1 tablespoon per gallon. For the ACV though it's recommended to alternate days with something else so you're not using that day after day. Probiotics are good for chickens for a lot of reasons.
There are a lot of folks that believe ACV water also prevents worms, it's only about making the environment in a chicken not pleasant for worms so they'll leave on their own accord. It's not a dewormer though.
None of the above will treat chickens for worms, but might help prevent them. Safeguard is the most popular product to treat chickens with worms.
