a banana related question

I have a bunch of bananas that for some reason have just failed to turn from green to yellow, despite waiting quite a bit longer than that usually takes.

Could I cook or roast these unripe and just use them as a starchy thing, as if they were plantains? Would that work? Or would they still taste as gross as raw green bananas? I dislike that mouth coating feeling you get if you do try to eat them green.

I'm particularly thinking of oven roasting them in their skin in hopes to get that off more easily, but I never tried this.