brindle vs steelhead

brindle

noun
  • An animal so coloured. 

  • A streaky colouration in animals. 

adj
  • Having such a colouration; brindled 

verb
  • To form streaks of a different color. 

steelhead

noun
  • The ruddy duck. 

  • The anadromous form of the rainbow trout, Oncorhynchus mykiss. 

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