Samsung has filed a patent for a foldable phone with a "waterproof housing". The document's images depicts this device as similar to the Galaxy Fold, but with a tougher-looking, possibly thicker, chassis. However, the internal tablet-sized screen remains more or less the same.
https://www.notebookcheck.net/Galaxy-Fold-Active-Samsung-patents-a-waterproof-version-of-its-first-foldable-phone.467188.0.html