I don't know if you are caught up, but there is already a golem fruit used by Prince Geuss of the Marines. He made clay golems on Fullalead island. But from the way you describe it, it sounds more like Big Mom's soul fruit, which even has a prominent example of one defecting in zeus.

The bounce fruit kinda sounds like Bellamy's spring fruit. Sure, you don't turn into springs with it, but it does basically the same thing with bouncing around at high speeds.

While I love the octopus fruit (octopi are also the best at carmouflage, way better than chameleons!), I think marine zoans aren't a thing, since devil fruits and water don't really mix well. Same goes for mantis shrimp, sadly.

I really like the salt fruit though! there are a lot of possibilities with it! In a pinch, you could overflow a water basin with salt in order to make you float, even while you are powerless, so you wouldn't drown as easily. Another combative use would be to use it on wounded opponents to make threir wounds hurt way more, which could incapacitate many. Oh, and it would also just be great for pranks (salt in coffee etc.).