flathead mullet vs haarder

flathead mullet

noun
  • An edible fish, of the family Mugilidae, found worldwide in tropical and subtropical coastal waters. 

haarder

noun
  • Planiliza haematocheilus, the redlip mullet, a mugilid fish. 

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