Answer:
Who keeps the ocean clean?
I jump when I walk and sit when I stand. What am I?
I have green hair a round red head and a long thin white beard.
I have memories but none of my own whatever's on my inside is what is shown. If I'm ever different it's because you changed me I feel like a decoration here for you to arrange me.
I plow and plow but never sow.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk