lol that's a good idea! I'll take Kona in early and let the hens show the way of the world Good luck with yours!
I'm sorry, but setting your puppy in with the hens to peck at her is a really bad idea. It can create fear in the puppy towards the chickens such that it will later want to chase and harm chickens, possibly its life long.
Germans are thinkers. They also can have very high prey drive. They also are very sensitive to their environment (which makes them such a good breed for police and guide work). You do not want to set bad experiences for a young pup. You will need to reinforce good experiences and good behaviors at all times.
Do not expect your older dog to teach the younger pup how to behave around chickens. It is good it isn't chasing chickens, so it won't show your GSD puppy bad behavior, but it will not teach your GSD good behavior and self control. That is your job.
Start by first by getting to know your pup for a week or so. Be sure to take it out by leash to relieve regularly. (Hint, feed cheese the moment your puppy does its business saying "Do your business," then praise it...Good Dog...soon your GSD will relieve on command.) I recommend a drag line to help your little one stay out of trouble in the house and any play time on the lawn. The best lesson starts with prevention. Always reward good behavior. Remove opportunity for bad behavior. When necessary correct bad behavior. (Dogs have a 3 second rule...correction or praise must be received immediately for THAT offense/good behavior or it will be attached to something else. Opportunity is a dog's self reward...if it succeeds once, it will assume it will succeed again. You do not want it to ever succeed with stimulation rewards for things you don't want...garbage raiding, chicken chasing, etc.)
After the first week of settling your puppy, I highly recommend that you start teaching your new little puppy good leash and obedience manners and a "leave it" command. Do not rush to introduce your GSD to the chickens. The stimulation could be frightening to an environmentally sensitive GSD or over stimulating to the more assertive type GSD. Both will bode poorly for the dog's success with chickens. (This comes from my training during 7 Guide Dog for the Blind projects...several with German Shepherds...one environmentally sensitive, one more assertive).
After basic obedience is secure, you can venture to more stimulating environments on leash. This takes slow steps of progression.
After your puppy has learned how to look to you for guidance and obedience while on leash, and likely not until it is older, perhaps 3 to 4 months, THEN take it on leash by the chickens. Reward it every time it looks away with a food treat. Say leave it if it looks at the chickens. (It should know the "leave it" command from earlier lessons.) Reward with food treat every time it looks or walks away. Leash correct if it jumps or lunges at the chickens. (Quick downward snap like snapping a towel with "Leave it"...when the dog looks at you, praise and reward it "Good Dog.")
Keep lessons short. Always end on a positive note.
Only after you can safely walk by the chicken coop on leash, and this may take a number of weeks depending upon the maturity of the dog, can you then put the dog on drag line and supervise.
Do not leave your GSD in a run with visual sight of the chickens. It will likely fixate on watching them which will translate into chasing them when it is out of the fenced run.
My suggestions...there is more to the training, but I've given you high lights.
Enjoy your little fluff ball. GSD are wonderful, intelligent, diligent, and energetic dogs. I wish you the best with him.
LofMc