pampelmoes vs shaddock

pampelmoes

noun
  • Synonym of pomelo, as both a large fruit of Southeast Asia and as a catchall term for other related fruit such as the grapefruit. 

shaddock

noun
  • Synonym of pomelo, in all its senses including (inexact) grapefruit. 

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