ball sack vs fink

ball sack

noun
  • An objectionable person (especially a man). 

  • The scrotum. 

fink

noun
  • A contemptible person. 

  • An informer. 

  • A strikebreaker. 

  • Any of several birds in the family Ploceidae native to southern Africa. 

verb
  • To betray a trust; to inform on. 

How often have the words ball sack and fink occurred in a corpus of books? (source: Google Ngram Viewer )