dogface vs pongo

dogface

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

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

  • An ugly person. 

pongo

noun
  • A soldier. 

  • A lazy, good for nothing person. 

  • A canyon or gorge in South America especially cutting through a ridge or mountain range. 

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