I've seen this before on the forums, it's apparently a mucocele and it must be treated asap. Chickens die from this if left untreated. Sadly I can't remember what the treatment is, you need to do some research. I'm sure it's somewhere in the forums.
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It was already posted by Wyorp https://www.backyardchickens.com/threads/help-my-silky’s-mouth-is-propped-open.1668168/post-28663590I've seen this before on the forums, it's apparently a mucocele and it must be treated asap. Chickens die from this if left untreated. Sadly I can't remember what the treatment is, you need to do some research. I'm sure it's somewhere in the forums.