It's a brainstorm, but I do have a start for the SCP.
Swell Sharks are small, friendly members of the catfish family that live in subtropical waters, making their homes among algae and boulders. They are almost puppy-like when they aren't hungry and are pretty cute. When the creature is irritated, it absorbs water to grow several times larger to scare of predators.
My idea is to have this creature absorb all things in it's area when irritated, shrinking as it does this, popping out of the area for a few seconds.
Link: http://scpsandbox2.wikidot.com/boondlook
First tab.