footpad vs sneak thief

footpad

verb
  • To sneak on foot. 

noun
  • An unmade, minor walking trail formed only by foot traffic. 

  • A medicated bandage for the treatment of corns and warts. 

  • The soft underside of an animal's paw. 

sneak thief

noun
  • A thief who steals without being noticed and without using violence. 

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