Jungle fowl are chickens, the difference is RJF live in the wild thus having the wild look but just because they look more wild doesn’t mean they aren’t chickens. Take quail for instance they are more domesticated breeds, but that doesn’t mean wild quail aren’t quail.Red junglefowl are not chickens, they are a separate species that was the wild ancestor of all chickens. While red junglefowl are masters of escaping predators, foraging, and doing all things a wild bird species does, the OP asked for chicken breeds.