When feeding a raw diet variety is the key. Just feeding chicken won't give him everything he needs, he also needs red meat, and preferably some fish as well for the oils. He doesn't need variety every day or in every meal, but he does need variety overall.
If you want to feed bone-in minces, you can get all sorts of meats, not just chicken. The bone-in minces do tend to be quite bone heavy, you will need to feed some plain meats as well.
You can feed frozen meat, lots of people do, I prefer to feed it at room temperature, really cold food doesn't seem to agree with my dogs tummies.
Brodysmom made a really good post recently about the types of bones that are safe to feed, definitely worth a read. I feed chicken portions, lamb and pork ribs, lamb necks, pigs tails, chicken and turkey necks, rabbit portions, and occasionally other game like pheasant and wood pigeon, as bony meals.
The rest of their meals (plain meat without bone) consist of pork, beef, lamb, green tripe, turkey, and beef, lamb, pigs and chickens hearts. When I can get it they get venison and goat. They also have oily fish about once a week, usually sardines, sprats or mackerel. This is generally fed frozen, for some reason they prefer frozen fish.
So you can see they get a good variety, (obviously they get their organs as well) I get everything except the tripe from either the supermarket or the butchers.