[@Zeroth] to use objects like rocks as tools

For example, sucking up a rock and using it to grind up the crystal inside me

Or, say I'm grappling another creature, can I also use said rock to repeatedly bash its face?


Edit: (just thought of another one)  sucking up water and mixing it with other substances inside me

Edit 2: Another question; can I dissolve objects without digesting them?

Edit 3: (why is there no end to my curiosity?)

Two more questions;

First, as a slime, is  slamming myself against others pretty much my only attack? 

Second, can I consume mana crystals despite having no spells?