If you get a couple hens for him, them living together shouldn’t be an issue. However, turkeys can get a fatal disease called blackhead from chickens. This does not always happen, and it is usually fine. On the bright side, keeping turkeys and chickens together gives the chickens an immunity to mareks disease, which is usually always fatal. The turkeys have a form of the sickness that does not cause tumors in chickens, so the chickens become immune.