con artist vs slyboots

con artist

noun
  • A person who defrauds or swindles others after first gaining their trust; a scam operator. 

slyboots

noun
  • A person who is clever or shrewd, especially one who is stealthy, manipulative, and rather charming. 

How often have the words con artist and slyboots occurred in a corpus of books? (source: Google Ngram Viewer )