Barb vs Tiff

Barb

name

  • A diminutive of the female given name Barbara. 

  • A surname. 

noun

  • A fan of the American singer Nicki Minaj, especially a female one. 

Tiff

name

  • A diminutive of the female given name Tiffany. 

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