Answer:
Soft and cuddly I'll pull on your heart. But take my last name and I'll tear you apart.
Cold head and feet; round as a ball; always turning around myself.
I have a few points but we're not competing. I'll help you win when you're eating.
I can speak with my hard metal tongue. But I cannot breathe for I have no lung
No matter how little or how much you use me, you change me every month.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.