fire-crotch vs redpoll

fire-crotch

noun
  • A person who has red pubic hair. 

redpoll

noun
  • Any of various finches in the genus Acanthis (syn. Carduelis), which have characteristic red markings on their heads. 

How often have the words fire-crotch and redpoll occurred in a corpus of books? (source: Google Ngram Viewer )