barney vs butt heads

barney

verb
  • To argue, to quarrel. 

noun
  • A minor physical fight. 

  • A student at Harvard University. 

  • A noisy argument. 

  • Synonym of blimp (“soundproof cover for a video camera”) 

  • A police officer, usually one who is inferior or overzealous. 

butt heads

verb
  • To argue uncompromisingly. 

  • To struggle against something that does not give way. 

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