Easy what am I riddles for kids with simple answers

When you don't have me, you want me, but when you do have me, you want to give me away. What am I?

I am a white box having no key or any lid. Yet there is a golden treasure inside it. What Am I ?

I live in the ocean. I move slowly. I eat clams. I have five arms. I am a...

I hiss. I can be poisonous. I am long. I have a forked tongue. What am I?

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

I'm tall when I'm young, I'm short when I'm old, and every Halloween I stand up inside Jack O Lanterns. What am I?

I live in the ocean. I swim wherever I want. I sing to my family. I can breathe through a hole in the top of my head. I am a...

I am small and shy. I have eight legs. I eat bugs. I catch them in my web. I am a...

I live in a house. Each Halloween I stand in a jack-o-lantern and get shorter as I grow old. What Am I?

What comes down but never goes up?