In La Theine, they can be found near the northwest chasm (just southeast of the zone to Ronfaure), and around near the zone to Valkurm. I don't know where else they pop.
I went there looking for them to level off of, because my THF is 11 and it says they go up to 12. All the ones that I saw checked as EP. Disappointed. >.>
They check as T in Giddeus, at level 11 but levelling off of them is complicated there because of the Yags.