While shopping for lumber recently I noticed an injured Pigeon. He/she couldn't fly and I was pretty certain it was only a matter of time before the bird starved or was run over. I live in the mountains about 75 miles from where I found "Galileo" and we have lots of doves but no pigeons...
Although I have not heard of chicks born without a beak, I am somewhat familiar with birds losing a top beak. We have a small parrot that lost her top beak 3 years ago! They do not grow back. But if your son is willing to put in the extra effort, it's possible this chick can learn to get...