cat's-foot vs fall guy

cat's-foot

noun
  • Synonym of cat's-paw: a foot of a cat; (figurative, obsolete) a person used unwittingly or through trickery by another. 

  • Synonym of mountain cudweed (Antennaria dioica). 

  • Synonym of ground ivy (Glechoma hederacea). 

fall guy

noun
  • One who is gullible and easily duped. 

  • A scapegoat. 

How often have the words cat's-foot and fall guy occurred in a corpus of books? (source: Google Ngram Viewer )