firebrand vs stormy petrel

firebrand

noun
  • An argumentative troublemaker or revolutionary; one who agitates against the status quo. 

  • A torch or other burning stick with a flame at one end. 

stormy petrel

noun
  • One who brings trouble or whose appearance is a sign of coming trouble. 

  • The storm petrel 

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