lay figure vs man in the street

lay figure

noun
  • An unimportant person; a character (especially in fiction) lacking individuality. 

  • A jointed model of the human body used by artists, or to display clothes. 

man in the street

noun
  • A typical person, unversed in a given subject; an inexpert commoner. 

How often have the words lay figure and man in the street occurred in a corpus of books? (source: Google Ngram Viewer )