crew cut vs fetlock

crew cut

noun
  • A closely-cropped male haircut in which the hairs stick upward, like the short bristles of a brush. 

fetlock

noun
  • The tuft of hair that grows at this joint. 

  • A joint of the horse's leg below the knee or hock and above the hoof. 

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