courgette vs squash ball

courgette

noun
  • The edible fruit of this marrow/squash. 

  • A particular variety of Cucurbita pepo, a small marrow/squash. 

squash ball

noun
  • A small rubber ball used in the game of squash. 

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