doughboy vs swaddy

doughboy

noun
  • An American infantryman, especially one from World War I. 

  • A kind of flour dumpling. 

  • Frybread. 

swaddy

noun
  • A soldier, especially a militiaman. 

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