Answer:
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
The more holes you cover the lower I go.
You cannot keep me until you have given me. What am I?
When it comes to me, you go on red and stops on green. What am I?
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
When someone uses this acronym, you know you've got to pick up the pace