allmouth vs angel shark

allmouth

noun
  • Any of the order Lophiiformes of anglerfish, such as Lophius piscatorius. 

angel shark

noun
  • A member of the unusual genus Squatina of sharks with flattened bodies and broad pectoral fins resembling skates or rays. There are approximately 16 known species, which are the only members of their taxonomic genus, family and order. They occur worldwide in temperate and tropical seas. 

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