bigender vs crossgender

bigender

adj
  • Having a tendency to move between feminine and masculine gender-typed behaviour depending on context. 

  • Having two genders simultaneously: both male and female. 

crossgender

adj
  • Across multiple genders; taking, or pertaining to, the traditional role of the opposite gender. 

How often have the words bigender and crossgender occurred in a corpus of books? (source: Google Ngram Viewer )