Snitz forum is based on MSSQL database, this is a totally different database engine. wpForo is based on MySQL, so there is no way to create a direct migration tool. We only recommend gConverter or ProfProjects services for such projects. They have already done hundreds of forum to wpForo migration projects with the best result.
In case you want to say thank you !)
We'd really appreciate and be thankful if you leave a good review on plugin page. This is the best way to say thank you to this project and support team.