They seem to be breathing just fine, the only thing they ate was Manna Pro Egg Maker and I gave them some clover and dandelion greens but that's it. The feed is a crumble type feed.See how they are in the morning. If they are still doing it, and more often, it's time to investigate. Did they have anything dry or otherwise difficult to swallow? Do they seem to have difficulty breathing? Let us know what you see in the morning.
Are you referring to Megan's issue? Chickens don't dunk their heads that I know of. Ducks need to get their nares wet.