First of all... Im so sorry this is happening and this is bad.
Your frog is freezing, this this body functions are shutting down add to it exstreme toxicosis due to the water used and you gave this. However... It's not too late until it is. You did a huge step towards helpng his and asked for advise! Now let's see how it'll go.
this is day 75-78 F, night 69-73F. You need to aim for day at 80-82, night 75-78. In Celsius day time should be at 27-29.4: Temperature: Day: 24 to 26 Celsius Night: 21 to 23 Celsius
the water part everybody has covered already, you haven't used vitamins for him as well.
a frog won't eat until he is better, if he can't use his eye balls, he can't swallow.
You need to do a full on hydrotherapy to help with water exchange and to flush toxins, he also needs to fix his electrolyte balance and vitamin deficiency. no guarantees here, hope he will make it.
That's what you need to do other just use different water. get unflavoured pedialyte, but the best would be to get special amphibian ringeri that is available at herp vets, it had a bit different formula then pedialyte.
You need to do a bath ( 20-30 min) In full strength amph.ringeri or 1:1 mix water- pedialyte. Do this for 4-5 days and see what's going on, update us, concentration will change later on.
Simultaneously you need to get reptiaid by fluckers. It is sold in powder form, if you can get it in him anyhow that would be great - Force feed or may be you can get him to eat food coated with it, whatever you try to get him eat has to be very soft, I'd just get some of that stuff in syringe without a needle and force feed. You see what works for you.
Full change of substrate. I suggest you keep him on papertowels for the time being.
Temperature.... You gotta fix it ASAP! But do it gradually, it's dangerous to get it from low to high fast, his kidneys might shut down.
would you please post pic of him from top and how big is be exactly? Can he use his legs?