what could the “gray leviathans” that the worldbook mentions be? whales and krakens are both mentioned separately, sometimes in the same sentence, so i assume they cant be the same thing as either. sea dragons? whale sharks? plesiosauria? giant crocodilians?

Not sea dragons. AFFC references Nagga the Sea Dragon feeding on grey leviathans. 

My guess would be GRRM-sized blue whale analogues.

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