In the beginning of chapter 4 of Speaker for the Dead, in Pipo's notes it says this :
As for what they call us, they do use human, of course, but they have also taken to using the new Demosthenian Hierarchy of Exclusion. They refer to humans as framlings, and to pequeninos of other tribes as utlannings. Oddly, though, they refer to themselves as ramen, showing that they either misunderstand the hierarchy or view themselves from the human perspective! And—quite an amazing turn—they have several times referred to the females as varelse!
But in chapter 9, in Miro's thoughts, there is this:
I wish, Ouanda, that you had not explained Demosthenes’ Hierarchy of Exclusion to them.
Now, Ouanda wasn't born until after the incident with Pipo. So when did they learn about the Hierarchy?
Just wanted to also point out that the Hierarchy had been published right before Ender left Trondheim:
Ender was startled for a moment to hear her use that word; but of course Demosthenes’ latest book had been published twenty-two years ago, and distributed through the Hundred Worlds by ansible.