Cthonian

Cthonians were among the legendary of “fictional” creatures kept in the Zoo of the Strange and Wonderful House. An old, experienced zookeeper once told a young recruit that one of the pieces of knowledge from works of fiction which she'd find came in handy as a zookeeper in this particular Zoo was “where to tickle a Cthonian”. (PROSE: Our Strange and Wonderful House: The Zoo)

Behind the scenes

This appears to be a misspelling of Chthonians, huge, burrowing eldritch worms from the Lovecraftian Mythos.

H. P. Lovecraft/Cthulhu Mythos-related concepts in Jenny Everywhere media

Individuals
Azathoth • Randolph Carter (Dwain Carter • Karolyn Carter) • Cthulhu • Nyarlathotep • The Repairer of Reputations • The Yellow King • Yog-Sothoth

Species & groups
Chthonians • Hounds of Tindalos • Old Ones • Outer Gods • Shoggoths

Locations
Carcosa • Kadath • Miskatonic University (Miskatonic School of Business) • Yuggoth

Texts
The King in Yellow • Necronomicon (Ficlinomicon • Plasmanomicon)

Other
Shoggoth's Old Peculiar Ale