Mimic Changeling (5e Race Variant)
From D&D Wiki
Strange mimics roam in human form, better than normal mimics can mimic a chest. The only two ways to tell are to either check their mouth, which reveals rows of sharp teeth, or check their hands, which have special, adhesive pads on the palms. It is unclear if mimic changelings were a horrible experiment or some cosmic bard joke where the bard was a changeling. Either way, the result is these strange humanoids that hide in different skins. They are incredibly wily, and hungrier than a normal changeling...
This race variant replaces the changeling instincts trait. You instead gain the mimic maw and mimic adhesive traits.
Mimic Maw. Your fanged maw is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.
Mimic Adhesive. You have advantage in ability checks made to grapple Medium or smaller creatures.