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Questions & Answers about ¿Tienes algunos libros?
Why use algunos here instead of algo?
Why does algunos end in -os?
Because it has to match the word it describes! Libros is a masculine, plural word, so "some" must be masculine and plural too (algunos). If you were asking about feminine things, like apples (manzanas), you would say algunas manzanas.
Could this sentence also mean "Do you have ANY books?"
Yes! In English, we usually ask "Do you have any books?" rather than "some books." In Spanish questions, algunos works perfectly for both "some" and "any."