mud trout vs squaretail

mud trout

squaretail

noun
  • A perciform fish of the genus Tetragonurus, found in tropical and subtropical oceans. 

  • The brook trout, a fish of the species Salvelinus fontinalis, found in North America. 

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