Oh, absolutely! Gotta use a localized standing army to enforce your control on things to ensure the serfs are thoroughly broken to avoid any kind of uprising!
But consider that for -any- culture you're bringing into the world based on physiological needs. What does an Ooze Person need to survive? Water, of course, to remain hydrated, and presumably organic matter to digest and add to, or restore, both lost mass and energy. But can those things be used as incentives to force work? Unless you live in a particularly arid region, which would be inhospitable to such a life form, probably not. Which means creating a coercive system of labor doesn't work on them.
Oozelings would make -terrible- employees on the Elf's farm.
How much would oozeling existence disrupt that labor system? And how -vilified- would the Elf want those Oozelings to be, on a cultural level, due to the social impact that their lifestyle devoid of monetized labor might have on his workers?
The farther you get from "Humans with a little twist" the more extreme the social and cultural impact these races would have in a world that could stand up to the weakest touch of logic. Which is why most campaign settings are based on humans and human experiences. We expect our fantasy to have things like towns and inns, taverns and shops. Things that could not, would not, exist on a world where a large portion of the world's population have no need for such things, and the remainder have wings.
Society, and the trappings we ascribe to it, come from very humanoid limitations and how we work together as a society to overcome or minimize those limitations through group effort. As well as how those in power seek to use those limitations to coerce compliance through a variety of systems, whether legal, economic, or purely social.
So probably stick to the Anthro/Furry races rather than going -too- far afield!