namaycush vs siscowet

namaycush

noun
  • The togue: a large North American lake trout, Salvelinus namaycush, usually spotted with red. 

siscowet

noun
  • A freshwater fish from Lake Superior in the Great Lakes, a variety of the lake trout. 

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