Can I use a form as a standalone page with SEO and point each form to its respective domain name?

Can you use jotform as a actual webpage with seo for each page/form and connect domain name to each form?

Let's break it down into 2 sections:

1. Use JotForm as an actual page with SEO

This can't be done because you won't have access to your form's HTML content by default. Not unless you have an existing website where you can embed the form, then using the form's Full Source Code will give you access to the HTML, scripts, CSS, and basically everything else, which should give you the freedom of optimizing it for SEO.

Note when using the Source Codes: Every time you change (add or remove fields) from your form in the form builder, you must update the form codes on your site by re-embedding the form. This is because the source codes that are currently embedded to your page are not automatically updated. 

Complete guide: How-to-get-the-Full-Source-Code-of-your-Form 

2. Point a form to a custom domain

This is achievable by adding a CNAME record that points to custom.jotform2.com with your domain or subdomain. 

Complete guide: How-to-use-Custom-Domains-with-Jotform 

To sum it up, if I'm in your shoes and my goal is to optimize the form's SEO as if it's a webpage and at the same time have it sit on my own domain, then I will just go with the form's Full Source code, and will deploy it to my own website.

This way, you're hitting 2 birds with 1 stone - You get to access the HTML content / add your SEO optimization AND have the entire source code embedded as a part of your own domain. You won't even need to add a CNAME record anymore since it already sits and resides on your domain.