Xendrogyne (also known as xenandrogyne) is a term for those who's gender is both androgynous/androgyne and xenine/xenogender. This identity can be fluid or fluctuate, and could also be used to describe a polygender identity where one has both androgynous and xenic genders. This gender does not necessarily have to be exclusive, and the two parts of this identity do not have to be equal.
Coining
The official coining post for Xendrogyne was posted on 10th February 2021 by xenovampire on Tumblr (sanguinebutch on wiki). It was coined on amino a few months before, but the exact date of this is unknown.