Answer:
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.
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
I have cities with no people, forests with no trees, and oceans with no water. What am I?
If you drop me, I'm sure to crack. Give me a smile and I'll always smile back. What am I?
You use a knife to slice my head but you weep beside me when I am dead
I will disappear every time you say my name.