tough cookie vs trooper

tough cookie

noun
  • A person who can endure physical or mental hardship; a hardened, strong-willed person. 

  • A hardy, resilient animal or plant. 

  • Something troublesome or difficult to handle. 

trooper

noun
  • One who endures adversity or hardship with an attitude of stoicism and persistence. 

  • A cavalry horse; a charger. 

  • A mounted policeman. 

  • A soldier. 

  • A soldier of private rank in cavalry or armour. 

  • A troopship. 

verb
  • To work steadily at an unpleasant job without complaint. 

  • To work as a trooper. 

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