cacolet vs foal

cacolet

noun
  • One of a pair of chairs or litters mounted on a pack animal (horse, mule, camel) 

  • A single litter mounted on a pack animal. 

foal

noun
  • A young horse or other equine, especially just after birth or less than a year old. 

  • A young boy who assisted the headsman by pushing or pulling the tub. 

verb
  • To give birth to (a foal); to bear offspring. 

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