dogface vs lancer

dogface

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

  • A foot soldier, especially during World War II. 

  • An ugly person. 

lancer

noun
  • Any of various Asian hesperiid butterflies of the genus Plastingia. 

  • One who lances something. 

  • A cavalry soldier armed with a lance weapon. 

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