In Ursula Le Guin’s Earthsea novels, the language of dragons is rather similar. The dragons speak the language of the making, or the ‘true speech’, from which flows the language of human magic. And dragons do not ‘learn’ the old speech - it seems to be inherent in them so that they 'are' the language. There are also ‘dragonlords’, who are people with whom the dragons will deign to speak.
Of course, the similarities are somewhat loose – I’m talking about inspiration rather than plagiarism – but they are there, principally in the association between the language of dragons and magical power.