I couldn't finish 'em. Looks like this's gonna get complicated.
The Desert Sahagin is an enemy in Final Fantasy Dimensions. It is encountered in the Challenge Dungeon of the The Memorist and The Dancer part. Since the Challenge Dungeons do not appear outside the original phone release, it is only dummied in the other mobile versions and therefore not available in any English version of the game. The wiki does not know what this enemy looks like, only that it is a Sahagin.
Sahuagin (often misspelled or transliterated "sahagin") are fishlike, monstrous humanoids that appear in the Dungeons & Dragons role-playing game.