In its original producing country it's often used as an expression of excessive softness ("tofu mental" for instance, for mental fragility). But it's also cute and inoffensive, I think it's a nice name overall.
I think OpenTofu should embrace the negative connotations. Go crazy, make everything Tofu, that's the goal. It'd be a nice side history for marketing purposes. I doubt anyone would not use the tool because of it and others would get a good chuckle.