double talk vs lallation

double talk

noun
  • Speech which combines English (or some other language) and native-sounding gibberish for humorous effect. 

  • Doublespeak. 

  • Lies, especially in a formal political statement. 

  • A situation when two people talk at the same time, causing overlapping audio signals. 

  • A simple phonetic code with a regular infix that makes meaningful speech sound unintelligible. 

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 double talk and lallation occurred in a corpus of books? (source: Google Ngram Viewer )