I found one of those in my yard, is it a hedgehog?

It’s porcupine

But I live in MA. There can’t be porcupines... or can they?

They are very shy creatures, but I live int eh western part of the state. Lots of wood to hide in.

What do you mean by western part of the state? Are you talking about Massachusetts or another state?

I live in western MA. About a mile from the Conn River

I live near Fitchburg