melanin-challenged vs pigskin

melanin-challenged

adj

  • white; having white skin or belonging to the white culture; not black 

pigskin

noun

  • Leather made from the skin of a pig. 

  • The skin of a pig. 

  • A football. 

How often have the words melanin-challenged and pigskin occurred in a corpus of books? (source: Google Ngram Viewer )