http://wiki.ffxiclopedia.org/wiki/Poroggo_Seducteur
Wiki has little to no info on these.
And according to this map, they are next to the Crapaudy.
However, I have yet to see them! Do they spawn under certain conditions like the ones in Saruta (S)? I'd like to learn Magic Hammer from them if possible since Atma makes Abyssea mobs easier to solo than most of their outside counterparts. I absolutely hate Mamook and want to avoid it if possible.