I think they do but at worst I know they have a generic "Celebrating" pin that you can write whatever you want on. Pro tip: Once you right on it cover it with see through tape so it doesn't rub or get washed off.
They don't. (I was looking for a graduation pin for my son) but I found one on Etsy! There are a couple of pin makers and they look just like the Disney ones. I ordered one! It was 4.99. I also ordered a Mickey plush in a graduation gown from the Disney shopping app.