As I have mentioned in earlier posts, these "white" turkeys are not a cross between demostic turkeys.

Here is a link to the proof from Mississippi State University:

http://msucares.com/pubs/infosheets/is0636.pdf

To summarize: "The smokey-gray phase occurs throughout Mississippi and is mistakenly thought to be a partial domestic turkey. Smokey-grey turkeys, usually hens, are whitish grayish on parts or most of their body. They are not part domestic, and they do successfully reproduce. Another color phase you sometimes see is the black (melanistic) phase. These turkeys have no other colors, just black. The true albino, with a total absense of any color, is rare."

And from the National Wild Turkey Federation

http://www.nwtf.org/new_turkey_look.html

Color Phases: A few wild turkeys grow unusually colored feathers. These are known as color phases. There are four color phases, a smokey gray color phase, a melanistic color phase (all black), an erythritic color phase (reddish coloration) and an albino color phase (very rare