Ducky & Bunny are major characters in Toy Story 4.
Bunny is a blue and green stuffed bunny, and a carnival prize who wants to be won.
Ducky is a stuffed duck and a carnival prize. He is friends with Bunny, and also wants to be won. Ducky's left hand is permanently attached to Bunny's right hand.
Toy Story 4
Buzz searches for Woody on his own, seeking guidance in the button-induced phrases from his own voice box. Buzz finds himself as a prize in a carnival booth and escapes with plush toys Ducky and Bunny. Buzz finds Woody and Bo, and they recruit Ducky and Bunny to help rescue Forky, promising that they will become Bonnie's toys, along with Bo's old friend from the antique store, Duke Caboom, a Canadian stuntman toy.
At the antique store, the toys' plan to rescue Forky fails. Woody, the only toy still determined to save Forky, has a falling out with the other toys, and indirectly insults Bo. As Bo, Duke, Giggles, Ducky, and Bunny return to the carnival.