I mean the incorporeal ooze could be default be hunting other incorporeal creatures. Which could be an amusing creature in a haunted house scenario. Or it could engulf and pin creatures using a telekinesis style effect.

Regardless my advice to the OP would be to just homebrew something if you want incorporeal oozes. Oozes in general have a limited amount of splat support and incorporeal oozes bring up a bunch of weird interactions that it would be easier to just have a DM ruling on.