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Yes, you can connect to MongoDB, according to this article here: Tableau & MongoDB: Visual Analytics on JSON at the Speed of Thought | Tableau Software
According to another KnowledgeBase article, you cannot bring BLOBs into Tableau: Oracle Fields Not Showing Up in Workbook | Tableau Software
I know it applies to Oracle, but I suspect that they're not supported datatypes at all.
I hope part of my answer helps.