on dit vs tales

on dit

noun
  • A flying report; rumour. 

tales

noun
  • A writ to summon people to court to fill vacancies in a jury. 

  • A person available to fill vacancies in a jury. 

  • A book or register of people available to fill jury vacancies. 

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