dingleberry vs nitwit

dingleberry

noun
  • A stupid or foolish person. 

  • Vaccinium erythrocarpum, the southern mountain cranberry. 

  • Dried fecal matter adhering to anal hair. 

nitwit

noun
  • A scatterbrained or stupid person. 

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