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This mod adds Changeling Origin - an odd creature that can change its form into creatures it kills.
"Changelings are shapeshifters that can take on the form of other creatures. As their descendant, you have inherited this ability, but activating it requires a blood sacrifice."
If you want to prevent players from shaping into some creatures, you can add them into tags/entity_types/denylist.
Creatures that are not allowed by default: Wither, Ender Dragon, and Vex.
If you are already using woodwalkers, adding this mod is not recommended as it will make the shape-shifting mechanic available only to Changelings.

New origin that can shapeshift into other entities