gink vs knucklehead

gink

noun
  • A guy, a fellow, especially (derogatory) a foolish, unworldly, or socially inept man; a goof. 

knucklehead

noun
  • An idiot; a stupid or inept person. 

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