cacolet vs dropping

cacolet

noun
  • A single litter mounted on a pack animal. 

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

dropping

noun
  • A piece of animal excrement; dung. 

  • The act of something that drops or falls. 

  • Something dropped; a droplet. 

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