cant hook vs unguis

cant hook

noun
  • A traditional logging tool consisting of a wooden lever handle with a movable metal hook at one end, used for handling and moving logs. 

unguis

noun
  • The nail, claw, talon, or hoof of a finger, toe, or other appendage. 

  • The slender base of a petal in some flowers; a claw; an ungula. 

  • An old measure equal to the length of the nail of the little finger. 

  • One of the terminal hooks on the foot of an insect. 

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