kerb crawler vs monger

kerb crawler

noun
  • Someone who drives slowly along roads seeking sex from prostitutes or other women. 

monger

noun
  • A person promoting something undesirable. 

  • A dealer in a specific commodity. 

  • A small sea vessel. 

verb
  • To promote something undesirable. 

  • To sell or peddle something 

How often have the words kerb crawler and monger occurred in a corpus of books? (source: Google Ngram Viewer )