Is It Okay to Ask A Classmate for Food?

I'm sitting in class right now, and we are taking a short break. I am thinking that I am super hungry. I'm also staring at a large bag of Doritos and a box of donuts, both of which are unopened. The classmate who brought them in offered them to the rest of us at the start of class, but no one wanted them, so they were not opened.

I am wondering if it is okay to ask him for some food. I am not sure if it is okay, because I don't know him. How rude would that be? "Hey, buddy (you have to use 'buddy' when you don't know his name), I don't know you, but could I have some food?"

So, is it acceptable or not?

I don't know, and class is starting again, so I lost my opportunity, and now I'm even more hungry than at the beginning of this unusual post.