gabbling vs yackety-yak

gabbling

noun

  • Rapid, confused speech. 

yackety-yak

noun

  • prolonged chatter; uninterrupted, idle talk; gossip 

verb

  • To talk pointlessly and uninterruptedly. 

How often have the words gabbling and yackety-yak occurred in a corpus of books? (source: Google Ngram Viewer )