*disclaimer* I personally, and probably incorrectly, look at it this way...
Someone explained it on here to me, I wish I could remember who, that naked neck is a breed and a trait. With that in mind, if a bird meets the breed standard for a Turken/Naked Neck, I view them as a Turken. If a bird has naked neck traits but doesn't meet the standard, I would call it a Naked Neck. I refer to all of mine as NN just because its easier and I personally don't care what mine are called.
Kind of along the same lines as referring to an offspring of an blue/green egg laying breed as an Easter Egger because they don't meet the breed standard. I also do not know what the breed standard is for a Turken, comb/feather coloring...I should look that up!
If you are breeding crosses for a specific reason, egg size or production, I would refer to them as type/type crosses so people who are interested in certain traits know what they are getting.
That is all 100% my personal view on my personal flock.