dragonet vs firedrake

dragonet

noun
  • A small dragon. 

  • Any of the small perciform marine fish of the families Callionymidae and Draconettidae (slope dragonets) found mainly in the tropical waters of the western Indo-Pacific, the family containing approximately 186 species in 18 genera. 

firedrake

noun
  • A fire-breathing dragon. 

  • A fiery meteor, an ignis fatuus, a rocket 

  • A kind of firework 

  • A worker at a furnace or fire 

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