Berry Pudding

Amorphous. The pudding can move through a space as narrow as 1 inch wide without squeezing.

Delicious Form. A creature that touches the pudding or hits it with a melee attack while within 5 feet of it must make a DC 14 Charisma Save or be charmed for 1 minute. Whilst charmed in this way a creature considers the pudding to be a delicious berry and uses its action on each of its turns to stuff chunks of the pudding into its mouth. Doing so deals 1d4 unavoidable damage to the pudding and 8d8 acid damage to the eater. Should a creature die as a result of eating the berry pudding their corpse liquifies over 1 hour before reforming as a new Berry Pudding.

Oozey Jelly. The ooze takes up its entire space. Other creatures can enter the space, but a creature that does so is subjected to the ooze's Engulf and has disadvantage on the saving throw.
Creatures inside the ooze can be seen but have total cover. A creature within 5 feet of the cube can take an action to pull a creature or object out of the ooze. Doing so requires a successful DC 12 Strength check, and the creature making the attempt triggers Delicious Form. The ooze can hold only one Large creature or up to four Medium or smaller creatures inside it at a time.

Loot.
When defeated players may roll a Wis/Int (Chef’s Tools) of DC 10 to collect and stabilise the ooze if they have a suitable container. This gives them 1d+1 doses of Berry Spice.

Pseudopod. Melee Weapon Attack: +3 to hit, reach 15 ft., 1 target. Hit: 0 (0d0 + 0) acid damage. This triggers delicious form on hit.

Gunk Shot. Ranged Weapon Attack: +0 to hit, range 25/40 ft., 1 target. Hit: 0 (0d0 + 0) acid damage. Whenever the pudding attacks in this way it takes 1 unavoidable damage and on hit triggers delicious form.

Engulf. The ooze moves up to its speed. While doing so, it can enter Large or smaller creatures' spaces. Whenever the cube enters a creature's space, the creature must make a DC 12 Dexterity saving throw.
On a successful save, the creature can choose to be pushed 5 feet back or to the side of the ooze. A creature that chooses not to be pushed suffers the consequences of a failed saving throw.
On a failed save, the ooze enters the creature's space, and the creature is engulfed. The engulfed creature can't breathe and is restrained. When the ooze moves, the engulfed creature moves with it.
An engulfed creature can try to escape by taking an action to make a DC 12 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the ooze.