dingleberry vs plonker

dingleberry

noun
  • A stupid or foolish person. 

  • Vaccinium erythrocarpum, the southern mountain cranberry. 

  • Dried fecal matter adhering to anal hair. 

plonker

noun
  • A fool. 

  • A penis. 

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