It can be used for things. Your second question is more precise, but it needs a question mark.
I'm asking for a toothpaste, toothbrush and shampoo from the house keeping service at a hotel. And I say?
Could you bring a few of them.
Could you bring a few of each.
Are both ok?
Does them have to be used to desribe a person, or can it be a thing as well?
You can say "a toothpaste" in Indian English, and possibly in other dialects also. But in mainstream AmE and BrE you have to say "a tube of toothpaste" or simply "toothpaste" in my opinion.
Could you bring a few? would be enough too.
And in some parts of the world I fear 'Can I get a few of each?' would do as well; (not in my hotel though )