pencil topper vs top hat

pencil topper

noun
  • A small toy or ornament to be attached to the rear (non-writing) end of a pencil. 

  • A pencil sharpener. 

top hat

noun
  • A kind of steel batten. 

  • A man's formal hat, with a tall cylindrical crown (often of silk). 

How often have the words pencil topper and top hat occurred in a corpus of books? (source: Google Ngram Viewer )