Apparently not, that's why Atamis Paradise no longer has them...
Actually, there were 3 (small) Merp LAs:
- OLA 51 (west of Atami's Paradise)
- what is now Farsight Plains (between Nea's and Silver Ridge)
- OLA 53 (north of Segna)
Most natural spawns of Eudoria do not seem to be hunting spawns, unfortunately. It looks as if the Merps were just put in as an addition to the main mobs to make things more 'interesting'.
I checked the former outpost south of Jason, but since the revive from there is Jason now, it does not really make sense to go all the way across the lake to hunt a few Merp, maybe get killed in the process and have to go back to finish a Merp off. The density is not that of a hunting spawn anyway.
Edit: There are also some Merp in the Miwak area (including the high altitude spawn around 379xx, 440xx), but, again, there are also Hiryuu, Atrax, Exa, Argo and Bristle as well.
The Solfais area, too, has a few Merps, but you have to run a lot for a few kills.
The only spawn with a high density I can think of right now is east of Chimera in the area between 808xx, 822xx and 817xx, 834xx. However, there are few youngs and there are also Tantillion in this spawn. Another difficulty is that you have to tp or fly there, because it is long way from the tp/revive.