As already posted -- your horse is in serious need of a good farrier/trimmer. I'm glad that you are searching out another one, since the first one you called gave a response that doesn't make any sense. You want the frog to touch the ground. And unless your son did a professional's job on the "first aid" trim job he did, those hooves would still need attention by a pro.
Please let us know when you find a new farrier and have a care plan. This is going to take quite a while to get straightened out, so be patient. In the meantime, read up on hoof care (Pete Ramey was already mentioned I believe) and ask your new farrier to explain what (s)he's doing and why. The more you learn, the more questions you will be able to ask.
I would not be riding this horse until a farrier OKs it.
My carrier came out this afternoon. The worst foot had something stuck in the frog that my son removed yesterday. The farrier trimmed him and put some kind of mesh across that foot with a shoe on top. He then filled the void with an epoxy type blue material that has thrush med in it. He stuck a box on that foot till the material hardened. We're going to use coppertox on the other feet. He said he will be fine. We're talking about him training the horse for me or maybe swapping for a Paint mare that he has. I really like this Buckskin so I'm probably going to keep him.