Can you replace vanilla extract for stawberry extract?

Coffee powder or almond extract.

You can try any sweet syrup (most of them) just don't use honey

Extract in "vanilla extract" is simply the liquid extracted from the insides of a vanilla bean.

They're both flavorings, so as long as you don't mind the almond taste, why not?

yes, as long as the flavor you want to achieve is vanilla and not maple.