MountainMan and ChickensForever are on the right track.
Just think. If I came up to you screaming and beating you with a dead animal, would you be afraid of the animal? or afraid of me?
The pups are waaaaay too young to be left to their own devices. It's like leaving a 6 yr old kid in a room full of candy by himself...
I would take the pup out on leash and praise/reward for calm behavior around the chickens. If he tries to chase the chickens, tell him "No" in a firm voice (without screaming which may just excite him), and stop him with the leash. I would not punish the pup just for looking, because he would be a crappy LGD if he never looked at his charges. The goal is to be able to calmly observe the birds without losing control and chasing. Reward any efforts in the right direction. Teach their obedience commands inside where they can easily be successful, then practice them outside closer and closer to the chickens.

Just think. If I came up to you screaming and beating you with a dead animal, would you be afraid of the animal? or afraid of me?
The pups are waaaaay too young to be left to their own devices. It's like leaving a 6 yr old kid in a room full of candy by himself...

I would take the pup out on leash and praise/reward for calm behavior around the chickens. If he tries to chase the chickens, tell him "No" in a firm voice (without screaming which may just excite him), and stop him with the leash. I would not punish the pup just for looking, because he would be a crappy LGD if he never looked at his charges. The goal is to be able to calmly observe the birds without losing control and chasing. Reward any efforts in the right direction. Teach their obedience commands inside where they can easily be successful, then practice them outside closer and closer to the chickens.