So, I'm seeing a little ambiguity in the way Magic Fang/Greater Magic Fang works with Claws. Now, it says that it applies to a single Natural Attack, then gives the examples of Bite, Slam, Unarmed. But it doesn't mention Claw.
Now, for everything else, if a creature has multiples claws, an effect is generally applied to all of them (like Weapon Focus: Claw, you get the bonus to all Claws, not just one of them, same with Improved Natural Attack; this is why Claws do less damage).
But I see people's breakdowns of Druids requiring them to cast GMF seperately for EACH Claw, which seems off, and because the description doesn't call it out specifically, I am unsure if this is correct or not.