bozo vs schlepper

bozo

noun
  • A stupid, foolish, or ridiculous person, especially a man. 

schlepper

noun
  • One who wanders aimlessly. 

  • A servant who carries things; a porter. 

  • Any manual laborer, or other lowly employee. 

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