What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Yes Rowan, you should be able to do that.
You can see here how to change the form font: Beautify your Form with Google Web Fonts
It would work in the same manner if the font is located somewhere else, but you would need to make sure that everything can be loaded from public (that is not behind some password protected pages).
Do let us know if you have any questions and we would be happy to assist.