tuffet vs tumpty

tuffet

noun
  • An inflatable cushion serving as landing area for precision accuracy parachuting. 

  • A clump of grass or similar vegetation; a small grass-covered mound. 

  • A large cushion which may have an internal frame, used as a low seat or stool. 

tumpty

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