You can make an "ice cream" with frozen bananas, you can use the frozen bananas as a base

[mother earth]

and add other fruits to your liking. There's an appliance sold just for this task, it's called Yonanas, but you can use a blender or a Vitamix. Freezing bananas is probably the way to go with the amounts you have.

http://www.yonanas.com/recipes