dogface vs peon

dogface

noun
  • A foot soldier, especially during World War II. 

  • Either of two pierid butterflies of the New World genus Zerene. 

  • An ugly person. 

peon

noun
  • A messenger, foot soldier, or native policeman. 

  • A person of low rank or importance. 

  • A lowly person; a peasant or serf; a labourer who is obliged to do menial work. 

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