doo-doo vs feces

doo-doo

noun
  • Excrement. 

  • Difficulty; trouble. 

feces

noun
  • Digested waste material (typically solid or semi-solid) discharged from a human or mammal's stomach to the intestines; excrement. 

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