hopscotch vs walk the tracks

hopscotch

verb
  • To move by hopping. 

  • To move back and forth between adjacent patterns by hopping. 

noun
  • A child's game, in which a player, hopping on one foot, drives a stone from one compartment to another of a figure traced or scotched on the ground. 

walk the tracks

How often have the words hopscotch and walk the tracks occurred in a corpus of books? (source: Google Ngram Viewer )