dingleberry vs drongo

dingleberry

noun
  • A stupid or foolish person. 

  • Vaccinium erythrocarpum, the southern mountain cranberry. 

  • Dried fecal matter adhering to anal hair. 

drongo

noun
  • A fool, an idiot, a stupid fellow. 

  • Any bird of the family Dicruridae. 

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