'possum is just an abbreviated way of saying the proper name opossum. Same animal.
Baby turkeys are called 'Poults'.
As far as pens for turkeys go, they will definitely wander farther than chickens. Mine always return to the barn, but most prefer to roost on top of the pens instead of in them. Only the big toms that cant fly actually go in the pens. One thing to keep in mind, that although they are larger than chickens, they are not predator proof. Coyotes, foxes, owls, eagles, dogs, etc... will kill them just like they do chickens. And young turkeys are even more vulnerable since they will still wander, but aren't as large.
Also I'm still trying to find a larger property that might be a bit more important atm
Edited by daskhan - 10/22/15 at 12:50pm