sucker

A person easily tricked or persuaded to believe something, often foolishly.

"He's a real sucker for a sad story."

To trick or deceive someone, often into doing something they wouldn't normally.

"They tried to sucker him into buying it."

A new shoot growing from the base of a plant or tree stem.

"Prune the suckers from the rose bush."

A disc-shaped organ on an animal, used for clinging to surfaces by suction.

"Octopuses use their suckers to grip rocks."