When were these trees planted?
To me, they don't look too bad at all. The leaves are curled but still nice and green. If I had to guess I'd say there's a bit of water stress going on. I'd say your trees' root system aren't able to get enough water to keep the leaves from curling, either because there's not enough water or those roots simply aren't established yet. Likely the latter. Don't overdo the watering. I would suggest some slow, deep watering. If you have a 5-gallon bucket, drill a tiny hole on the side near the bottom, fill the bucket, and set it above where the roots are located. Let it drain overnight, the slower the better.
You might also find this a good time to do some summer pruning. Those branches look like they could use some cutting way back. That would reduce the workload on the roots and possibly balance your trees' root systems vs their tops. If they were recently planted, the roots likely are behind in development compared to the tops.

They have been in the ground for 5 months. The were better looking (leaves all flat) up until about 2 months ago. It is hot and dry here in the summer, so I watered them daily. Ever since the temp has cooled down around here, I do it maybe twice a week, if that, usually once a week. I made a wall of soil about 3 feet away around the trunk, about 4 inches high. When I water, I leave the hose in there until the water level goes up to 2 inches. I do this once a week for 2 months now. Am I doing anything wrong? I will go ahead and prune it back some as you suggested.

Thanks a lot!

Sounds to me like you're doing a good job with the water.

Looks like heat stress to me. Note the newer leaves look fine. Newly planted trees are more susceptible to everything since they are just getting established. I wouldn't worry about what you see there.

Scott