cat's-foot vs easy mark

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). 

easy mark

noun
  • someone who is easily fooled or victimised 

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