I float in the ocean, cold and white. Most of me hides below the water. What am I?

A time when I'm green, A time when I'm brown. But both of these times, Cause you to frown. But just in between, For a very short while. I'm perfect and yellow, And cause you to smile. What am I?

It's sooo hard to see deep under the sea. That's why I always carry a light with me. My cousin wears his on his head, I carry mine in my belly instead.

I grow in the earth, a healthy delight, From leafy greens to roots, I'm a colorful sight. What am I?

I don’t eat breakfast, I don’t have feet, But I love a tree stump to feast