It is Long

What comes once in a minute, twice in a moment, but never in a thousand.

What am I?

I am big and blue. I am a Mammal.

I live in the ocean. I can swim.

Who I am?

I am the second planet from the sun.

I spin the opposite direction as Earth.

who am I?

I eat insects. I live in the pond.

I hop. I am green.

Who I am?

 I have branches, but no fruit, trunk or leaves.

What am I?