Beanie (Yoshi's New Island)
From the Super Mario Wiki
Beanies are green, bean-like enemies that appear in Yoshi's New Island. They are only found in World 1-8: Big Beanie's Castle. They approach Yoshi and Baby Mario by hopping towards him in a similar manner to Burts from the previous Yoshi's Island games. In the castle's final room, Kamek "plants" a Beanie with his hammer, which grows into a beanstalk leading to the sky, where it grows into Big Beanie, the boss of the level. During the boss battle, Big Beanie spits out Beanies at Yoshi, which he can eat to make eggs to throw at Big Beanie.