Answer:
I have thirteen hearts but no body or soul.
My teeth are sharp my back is straight to cut things up it is my fate.
My head bobs lazily in the sun. You think I'm cute, for my face is yellow, my hair is white and my body is green. What am I?
I am an object which is used in baseball during the day I can't be seen at all
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.