Some good chicken toys are hanging up lettuce for them to peck at or sticking a stick through an apple then sticking it in the ground
you can also buy some like chicken swings or what I call chicken piñata’s
But what I think you should try is a mirror. Chickens love to look at themselves in a...
I has this problem with my chicken so i don’t know if it’s the same but you could try putting your hand over it’s mouth so it can’t bite you until it learns not to do that. (Sorry for my run on sentence)
I had a chicken like that. She was always smaller than the others and still is but she is perfectly fine. She might just genetically be small. But as long as she seems healthy she should be fine.
I think you should we lock them out most of the day but have certain times where they can go into there coop in the middle of the day so they can slowly get used to being out of it. You can also maybe get them some toys for them if you think they would get them to get them out of the coop and...