Does the Quran Mention Dragons?
No. There is no dragon in the Quran. Where the Hebrew Bible and the New Testament both have one, the Quran consistently uses ordinary words for snakes.
Arabic has a word for the thing. Tinnīn means a large serpent or dragon and is cognate with the Hebrew tannīn. The Quran does not use it.
The test case is Moses before Pharaoh, which the Quran tells three times. At 7:107 and 26:32 the staff becomes a thuʿbān mubīn, a plain or manifest serpent, the largest word used. At 20:20 it becomes a ḥayya tasʿā, a snake that moves. At 27:10 and 28:31 it moves like a jānn, which is a small and quick serpent.
So across three tellings of one event the creature gets smaller. That is a deliberate narrowing, and it is the clearest answer to the question: the Quran is not silent about dragons by accident. It had the word and did not use it.
Further in
Acenes of Sparta: The Dragon Slayer
A dragon is the reason the 300 died. Leonidas used the magic of the gods to bind Kalaxes beneath Taygetus, and the price was his life and his men's. Sixty-two years later a seven-year-old of the agoge falls into the dragon's crypt and inherits the unpaid balance.
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