musclebrain vs musclehead

musclebrain

noun
  • A large, strong, but inept, bumbling, buffoonish or unintelligent man 

  • A person who actively participates in physical sports, possibly highly skilled in sports, but does not do well in academic activities, like math and science 

musclehead

noun
  • A large and muscular man, especially one interested in bodybuilding. 

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