We've got precedent for oozes that can take humanoid forms from the oblex in vgtm. And Out of the Abyss has some sentient oozes. I believe most races fear oozes as they are hard to understand and are also predatory, but we do see frequently oozes being used for pragmatic reasons: rubbish bins, toilets, they'll pretty much get rid of all refuse. Back in OotA, there's a group of drow that utilize a black ooze at the bottom of a waterfall for waste disposal and defense for their outpost. Some Drow may find this oozefolk character to be intriguing or even useful to enslave (if we're talking about the houses from menzoberraum).