I recently noticed that the Drowned God in the Game of Thrones series is quite similar to Cthulhu/Dagon.
There’s a similarity between its litany and the famous couplet from the Necronomicon:
What is dead may never die, but rises again, harder and stronger.
That is not dead which can eternal lie,
And with strange aeons even death may die.
The location of the cult, the Iron Islands, has the air of a sinister Lovecraftian small town such as Innsmouth, being poor, isolated, and hostile to outsiders (as well as, obviously, being by the sea).
The ruling family, the Greyjoys, also uses a kraken on its arms: