middle-age spread vs tum-tum

middle-age spread

noun
  • Belly fat that develops in middle age. 

tum-tum

noun
  • Stomach. 

  • A dog cart; a rickshaw; a kind of vehicle. 

  • A dish made in the West Indies by beating boiled plantain in a wooden mortar until it is soft. 

  • Abdomen. 

How often have the words middle-age spread and tum-tum occurred in a corpus of books? (source: Google Ngram Viewer )