natter vs talk the hind leg off a donkey

natter

verb

  • To talk casually; to discuss unimportant matters. 

  • To nag. 

noun

  • Mindless and irrelevant chatter. 

talk the hind leg off a donkey

verb

  • To talk a lot. 

How often have the words natter and talk the hind leg off a donkey occurred in a corpus of books? (source: Google Ngram Viewer )