Short easy who am I riddles for kids

I am a large cat, but I don't meow. I have a loud roar that can be heard from miles away. Who am I?

I am known as a king, and the jungle's where I reign. It is hard to tame me, and I have a large mane. Who am I?

A father's child, a mother's child, yet no one's son. Who am I?

I eat other animals. I have a big mouth. I am green. I live in the water. Who am I?

Slayer of regrets, old and new, sought by many, found by few. What am I?