boofhead vs dumbo

boofhead

noun

  • An idiot; a fathead. 

  • An oversized head. 

  • A person with an oversized head. 

adj

  • Fatheaded; stupid; dimwitted. 

dumbo

noun

  • A stupid person. 

  • "Stupid person," by 1951, American English, from dumb. The Disney musical cartoon is from 1941; in it the elephant's name is a mocking nickname based on Jumbo. 

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