anaconda vs trouser monkey

anaconda

noun

  • A large penis. 

  • The green anaconda; Eunectes murinus. 

  • Any of various large nonvenomous snakes of the genus Eunectes, found mainly in northern South America. 

name

  • A particular variety of stud poker. 

trouser monkey

noun

  • The penis. 

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