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.
You can check questions related to HIPAA on this thread http://www.jotform.com/answers/333046-is-JotForm-HIPAA-Compliant#0.
I don't think Jotform provides any signed business agreement form HIPAA since not all of Jotforms feature is HIPAA compliant. So your question about if jotform can sign a business agreement I don't think that Jotform will be able to provide that.
You can read the link I've mentioned above so you can make your form HIPAA compliant.