gup vs lallation

gup

noun
  • Gossip or rumor; nonsensical or silly talk; blather. 

  • An elected head of a gewog in Bhutan. 

lallation

noun
  • Baby-talk or gibberish. 

  • The incorrect pronunciation of the letter "r" so that it sounds like an "l" (or "w"). 

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