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I think it's that headgear....
Fragment of a discussion from Talk:Teeny Nao
Seems to be no reference to "Teensy Nao" in the itemdb, unless that's controlled by server, which would make a tiny bit of sense. And yes, the item is untranslated. :(
And considering even the mystery box list, populated by nexon, called it Nao Tan and in their announcement, it's probably going to be Nao Tan.