This item will slowly heal whomever it is stuck to. It can be transferred to another fighter through contact.
Super Smash Bros. Ultimate's item description

Healing Sprout is an item that appears in Super Smash Bros. Ultimate.


It functions similarly to the Gooey Bomb, but rather than exploding, it gradually heals anyone it stuck to for a certain amount of time. Many Healing Sprouts can be attached to the same fighter to multiply its healing effects. It can also heal anyone that grabs it.