Green tea kit kats do exist.
In fact, they have a thing for flavouring kit kats here. I had both McFlurry Coffee flavoured kit kats and some "grapes of alexandria" or something kit kats as well. They were both awful.
There's also this absolutely terrible creation of
Pepsi White.
EDIT: Also, Pocky < Toppo < Fran. If you can pick up some Fran you won't regret it.