piebald vs pinto

piebald

noun
  • An animal with piebald coloration. 

adj
  • Spotted or blotched, especially in black and white. 

  • Of mixed character, heterogeneous. 

pinto

noun
  • A horse with a patchy coloration that includes white. 

adj
  • Pied, mottled. 

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