fleabrain vs peabrain

fleabrain

noun

  • A stupid or foolish person 

peabrain

noun

  • a stupid or clumsy person; a cretin. 

  • the brain of such a person. 

adj

  • stupid, clumsy, idiot 

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