Name tags need to be renamed first in order to make then usable. Since you can't rename an item to a name it already has, it is impossible to give a mob the name "Name Tag" by using the name tag item.
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I can confirm it. http://www.youtube.com/watch?v=BsAF_NSSY0g&feature=youtu.be
Does renaming the item to something else, and then renaming it "Name Tag" again work? The item will store its anvil uses, so the game should use this to determine that it's been renamed at least once.
Relinking to MC-15663 because it is more general.
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