Are there any jazz articulations in Dorico? I would love to use a scoop.

I’m afraid not yet, no, though we definitely plan to add them. For now you can put them in using Shift+X text, and position them manually in Engrave mode. Find the right character here, then paste it into a text item, and make sure to change the character style to ‘Music text’ using the menu at the top right-hand corner of the text editing popover.