Well Kaitlyn I can honestly say that he is in trouble. He is malnourished and was trying to aestivate. He appears to be severly stunted as well. He should be much larger than he appears.
I'll start with the problems.
First there should never be a dry side in the tank. A warm and cool side providing a climate gradient is fine, but the coconut fiber should never be dry anywhere. It should all be moist or heavily damp. Also you should be using dechlorinated tap water or natural spring water. The pond water will contain oarasites and bacteria that will make your frog sick. Change that immediately!
Second he should be fed much more than 3 times a week and if this is howbyou have been feeding him since you got him then this explains the start or MBD and his malnourishment. Babies and juviniles should be fed daily to every other day and once they reach adulthood it is fine to feedp them every couple days. He also needs a calcium supplement that contains Vitamin D3 to allow him to metabolize the calcium to bone. He also needs a reptile/amphibian multivitamin. Calcium dusting should be every other feeding and the multivitamin dusting only once a week.
My advice is to go out and buy some Unflavored Pedialyte, Fluker's Repta-Boost, honey, and he supplements I mentioned above.
Until he is strong enough to eat on his own I would force feed him the Rept-Boost according to the dosage directions in the box.
Also prepare a medicated soak of Unflavored Pedialyte, luke warm dechlorinated water, and honey. The bath should be no deeper than up to the frog's chest. Prepare it as follows;
Prepare a luke warm bath(78°F to 80°F) at a 10 to 1 ratio. So for every 10 ounces luke warm dechlorinated water add 1 ounce unflavored Pedialyte. Add 3 drops of honey to the bath and dissolve it in. Place the frog in the bath and soak him for 15 to 20 minutes or until the bath cools. After time is up or the bath has cooled prepare a second luke warm dechlorinated bath of just dechlorinated water to rinse him off and keep his body temp up to par. After this bath is complete then give him his dose of Repta-Boost. Do this daily and it is ok to go ahead and offer him crickets, but take the hind legs off of them so they can't jump. Tjis makes them very easy prey.
You can mix a small amount of calcium powder and multivitamin in with the Repta Boost that you are going to give him so that he gets an extra boost, but only do this every 3rd or 4th dose so that he doesn't get vitamin toxicosis.
His day temps should be 80°F to 82°F and night temps should hover around 78°F. Humidity should be 70% to 80%.
If you can post some good pictures of his enclosure and more of him so I can look him over.
Also just so you know Earthworms are pretty much the best feeder for frogs. They are highly nutritious and easy to digest.
Keep me posted.