What playable races are 100% human-descended? Which actually count as human?

[Katie Boundary]

And, once again: what's with Frost Folk from Frostburn?

Medium Monstrous Humanoid (Cold), no humanblood trait.

But they should have it, as they're just humans who sold their souls to the ice gods

Talaire from Complete Psionic are a peculiar race that don't have the normal traits entry. They are described multiple times as humans, and the only difference being their bonus feat must be a specific one depending on their house association.

*consults the books*

It sounds like, if you want to be one, you just pick the standard PHB human as your race and then one of the House-specific wild talent feats as your level 1 bonus feat... so they're not really a race just like Dragonwrought Kobolds aren't a race and Mithril Warforged aren't a race.

EDIT: in fact, you can take the house-specific Wild Talent variants AFTER character-creation, and spontaneously turn an ordinary PHB human into a Talaire. So definitely not their own race.

EDIT 2:

Tarmak got full Racial Traits listed in 3rd-party Races of Ansalon

I apologize for not investigating this earlier. I didn't realize that you were talking about a Dragonlance book. All three of the Ithin'carthian "races" qualify. Good catch!