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The accepted translation of Lovecraft's "Cthulhu fhtagn" seems to be "Cthulhu dreams".
How would one conjugate "fhtagn" to get the word derivations "dream", "dreamer", "dreaming".
This answer had a helpful link for translations, but not much in the way of deriving conjugates.
Lovecraft probably didn't think about grammar, and we certainly don't have enough material to reconstruct one. Could also be like Sindarin, where Tolkien wrote much, but never released any specification of the language. Quote from the threat you linked: "To my knowledge, we only have the transcription in the Latin alphabet" (comment from Sparksbet).
