chunter vs talk the hind leg off a donkey

chunter

verb

  • To speak in a soft, indistinct manner, mutter. 

  • To grumble, complain. 

talk the hind leg off a donkey

verb

  • To talk a lot. 

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