fink vs least weasel

fink

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

  • An informer. 

  • A strikebreaker. 

  • A contemptible person. 

verb
  • To betray a trust; to inform on. 

least weasel

noun
  • The common weasel, little weasel, or simply weasel (Mustela nivalis), the smallest member of the weasel genus Mustela, native to Eurasia, North America, and North Africa. 

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