muttonhead vs squarehead

muttonhead

noun
  • A stupid or foolish person. 

squarehead

noun
  • A socially conventional or boring person. 

  • A foreigner of Germanic origin, especially a German, Dutch, or Scandinavian person. 

  • An honest person; a non-criminal. 

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