BAD NEWS: none of us who create anything in any medium will ever as long as we live have a single better idea or even as good of an idea as what I’m about to show you
Encounter: Giant Shark Bowl Ooze
Since it doesn’t seem like anyone’s given an appropriate source for this wonderous monster…
You can find it in Kobold Press’s Creature Codex! That book and it’s predecessor, the Tome of Beasts, are awesome 3rd party monster addons that we wholeheartedly recommend!