Is there a Dremel attachment for removing Gorilla Glue?
It is polyurethane. Much easier to slice than to grind, as it tends to get a bit gummy, and the things that you glue (e.g. wood) tend to be softer than the glue itself, meaning  that you are risking damaging the workpiece.

If you had to, I'd use a vibrating oscilating mini-saw on a nultifunction tool but I generally just use a razor.