How long have your frogs been in this tank? If they were just recently introduced, there might be an issue with the tank, and it might require a rebuild.
Ugh - that's really warm for your frogs. Do you have any ventilation? What kind do you have? There are caresheets that show the min/max temp range for pdfs -ive had them for about a month and they did the same thing when i first got them and then after a while they started to stop a little. A couple days ago there was a day it just got really hot and the tank went up to 90 degrees. Could this be the reason?
I have to agree with BoonDoggle.My guess is they are trying to find someplace 10 degrees cooler.
Another great (and easy) way to cool the tank down is just raise the light a little bit. No matter what way you do it, the tank does need to be cooled down a little bit though.I have to agree with BoonDoggle.
Sorry - I missed the part about you having Cobalts. NOTE to SELF: read posts more closely.
Is there someway that you can cool your tank? Possibly move it to a cooler room? Install a window unit? I'm thinking even a fan over the vent screen, assuming that you have one, might help. I wouldn't place it where it blows down, but blows across.
keep us posted -