Tubcreak

There are plenty of things that make creaking sounds, plenty of creatures too. But one creature with a distinct creaking sound is Tubcreak.

It has the body of a white bath tub along with four little golden feet. It's far smaller than a normal bathtub, and is light as a feather despite how heavy it might look. But when it goes for a little float through the air, you quickly see why it gets its namesake as it lets loose a distinct and loud creaking noise. Usually this noise is emitted when it comes to a stop, though there are times it creaks when floating peacefully.

This is a creature that will vanish when noticed, but reappear when it thinks the coast is clear. It's said that Tubcreak has a higher chance to appear after taking a shower before bed. That being said, it's still a frequent sight even on nights when you don't shower just before bed.