bonehead vs lame duck

bonehead

noun
  • Someone who is stubborn, thick-skulled, or stupid. 

lame duck

noun
  • A person or thing that is helpless, inefficient, or disabled. 

  • An elected official who has lost the recent election or is not eligible for reelection and is marking time until leaving office. 

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