doo-doo vs spoor

doo-doo

noun

  • Excrement. 

  • Difficulty; trouble. 

spoor

noun

  • The track, trail, droppings or scent of an animal. 

verb

  • To track an animal by following its spoor 

How often have the words doo-doo and spoor occurred in a corpus of books? (source: Google Ngram Viewer )