fresh meat vs rookie

fresh meat

noun
  • Any newcomer. 

  • Used other than figuratively or idiomatically: see fresh, meat. 

  • A person or group of people who arouse one's interest, either as a new target for deception, humiliation or ridicule, or as a potential love interest or one-night stand. 

rookie

noun
  • A novice. 

  • A type of firecracker, used by farmers to scare rooks. 

  • An athlete either new to the sport or to a team or in his first year of professional competition, especially said of baseball, basketball, hockey and American football players. 

  • An inexperienced recruit, especially in the police or armed forces. 

adj
  • non-professional; amateur 

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