When I'm ready or have enough banana's for the bread I take the banana's out and let them thaw at room temperature, once thawed they are mushy which makes it so much easier to make banana bread with, just peel and scoop out the banana with a spoon into your bowl.
I should warn you they will turn a dark black after their frozen but not to worry your only cooking with them. They are still very usable for almost any recipe that calls for bananas and most recipes call for mashed bananas so after being frozen and thawed they are basically already mashed, I just use a spoon to scoop out the banana into the bowl I'm using.
Banana bread is the simplest bread that you can make, and very delicious. It's almost next to impossible to end up with a bad loaf unless you totally burn it.