How to give an unique tag to submissions?

Is there a way to track inbound leads from organic traffic by giving each one a unique tag that would pass this info onto our CRM?

You can set an unique ID to each submission made on your form, this is achieved with a widget and here is a guide that will provide you with more details about it: How-to-Add-Custom-Unique-IDs-to-your-Form-Submissions

Regarding to send it to your CRM, here is a link with our current CRM integrations: https://apps.jotform.com/category/crm 

If the one you're using is not listed there then you may provide us the tool's name so we can assist you better with that.