Depending on your edition preferences, you may be somewhat confused by the existence of this entry. In 3e and 5e (and, I'm forced to assume, 4e, but who cares about 4e), lizardfolk spoke Draconic. This is, I think, a result of efforts in 3e to simplify the number of languages floating around -- the 3e Players' Handbook lists exactly 20 “common languages" that a character can take, and those cover the vast majority of cases; then there are a few entries in the Monster Manual that give creatures their own languages.1
The PHB languages are notably limited, though: seven are languages that a particular race or class starts with by default, like Dwarven; eight are languages spoken on other planes of existence, like Abyssal. The remaining five are Draconic, Giant, Gnoll, Goblin, and Undercommon. A lot of effort was made to ensure that players got their skill points' worth out of picking those languages, and creatures that formerly had their own language were pigeonholed into one of them for player convenience. This included the lizardfolk, who in AD&D had their own language, but now speak Draconic.
The PHB languages are notably limited, though: seven are languages that a particular race or class starts with by default, like Dwarven; eight are languages spoken on other planes of existence, like Abyssal. The remaining five are Draconic, Giant, Gnoll, Goblin, and Undercommon. A lot of effort was made to ensure that players got their skill points' worth out of picking those languages, and creatures that formerly had their own language were pigeonholed into one of them for player convenience. This included the lizardfolk, who in AD&D had their own language, but now speak Draconic.
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| They also used to be called “lizard men", but we can leave that one behind. Image from the AD&D Monstrous Manual. |
In my campaign world, the “lizardfolk speak Draconic" thing is, in-universe, a common mistake. Their language is related to Draconic, but, importantly, the lizardfolk came first. It's just that the major civilizations have a healthy respect for dragons, and none for the primitives living out in the marsh, so they assume the lizardfolk borrowed the dragons' language rather than the other way around.
So, the language. As before, here is the completed PDF, and below this line, I will just ramble about the reasoning behind the decisions made in said PDF.
So, the language. As before, here is the completed PDF, and below this line, I will just ramble about the reasoning behind the decisions made in said PDF.

