quakebuttock vs yellowbelly

quakebuttock

noun

  • A coward. 

yellowbelly

noun

  • A coward. 

  • Someone from Lincolnshire. 

  • The golden perch, Macquaria ambigua. 

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