Hi! I have only recently heard of Jamba Juice, and don't have any of their recipes but I do have a smoothie recipe that I make for my kids and they love it.
1 frozen banana
3-4 frozen strawberries
1/2 cup vanilla yogurt
1 tsp honey (not for kids under 12 mos)
3/4 cup juice (I use Juicy Juice Kiwi Strawberry because it makes the smoothie taste sweeter)
Blend it all up until smooth and voila! My kids fight over any that might be left in the blender, lol. Makes about 16 oz. You can use tofu in place of the yogurt if you want. I did it a few times until my older kids found out and refused to drink it anymore, haha.