doublespeak vs jibber-jabber

doublespeak

noun
  • Any language deliberately constructed to disguise or distort its actual meaning, often by employing euphemism or ambiguity. 

jibber-jabber

noun
  • Excessive or meaningless talk. 

How often have the words doublespeak and jibber-jabber occurred in a corpus of books? (source: Google Ngram Viewer )