heads or tails vs pitch and toss

heads or tails

noun
  • The practice of flipping a coin in the air, to choose between two alternatives based on which side lands face up. 

pitch and toss

noun
  • A game in which coins are thrown at a mark, the person who throws nearest having the right of tossing all the coins, and keeping those which come down head uppermost. 

  • Careless treatment of something, or trusting to luck about it. 

  • A game played by tossing a coin and calling heads or tails. 

How often have the words heads or tails and pitch and toss occurred in a corpus of books? (source: Google Ngram Viewer )