That looks like a Robin. Because the feathers are not fully out of the quills, it cannot fly so the parents can't take care of it on the ground. If the friend can find the nest, they can put it back in the nest and the parent birds will probably take care of it. Your friend might even try making a make-shift nest out of a box, small collander, or something else, and place it in a tree and see if the parent birds come to feed it.
If the parent birds do not come back, he can bring it inside, place in a tissue-lined bowl, and feed it watered-down canned cat food, using a syringe.
Once the feathers are in and it can hop and fly a little bit, the parents might come back for it. Baby Robins cry for the parents, which may draw them to it at that point. Normally, Robins feed fledglings on the ground, until they are strong enough to be on their own, but not when the feathers are not fully formed and cannot fly some.