I asked the very same question just about two years ago. I was told 'yes' you can and 'no' you can't.
I only had room and housing to put him in with my chickens (on about 3 acres of land). Things were going ok.
I did have a rooster that bullied my turkey and I ended up getting rid of the rooster (because of the bulling). It seemed as if my tom turkey started acting as if the hens were "his" more and more once I got rid of the rooster and he did not have anyone to challenge him.
Then a few weeks ago, he attacked a friend's 17 year old daughter. We thought it was the bling on her belt (it was covered with rhinestones and the sun made it flash and sparkle) cause he had never tried attacking anyone and had never even acted aggressive. But since then he has attacked me several and last time it was super vicious attack. I managed to beat him off and not get hurt myself. But I did notice he started chasing the chickens a lot and especially would be mean with them when he would try to attack me and I fended him off. He would turn his aggression on the chickens. I even ended up with one of my speckled sussex getting a hurt leg. (she is healing). Plus, he started wanting to get on top of them to mate. A turkey is way too big to be on top of a hen. No matter what breed of hen, no matter what size, etc. I knew the turkey had to go.
After seeing how things worked out in my case, I would never have a tom turkey in with chickens again.
Now as for my hen turkey, she has never been aggressive nor acted nasty to my hens. She has always acted as if she was just one of them. I am hoping it stays that way.