Hmmm...
I know this thread is pretty old and dead, but in case someone stumbles upon it (as i did) and is looking for accurate advice....
Yes! Chickens absolutely can have coconut! We feed fresh coconut meat from our own trees whenever we have the opportunity. When we have a large amount we will crack open a few daily and offer it on the "half shell" free choice--they get as much as they will eat, basically. It is in fact quite good for them, and I and other local farmers have noted (anecdotally) that it has a very positive effect on egg production. Fresh Coconut has a lot of high quality fat (something most poultry rations dont) as well as some carbs, a little protein, and important trace minerals. And, if you have access to coco trees, its free feed!
Cheers!