You know I kind of agree with you Maharg, but I think it's all a matter of being careful. I try to keep all my frogs at 80ish in their enclosures (tub rack). The ambient air for them is about 78 at all times and they don't have anywhere to burrow since they're on filter so that's the temperature they stay at. I bath them in 85, which is only 5 degrees warmer, but it's a sudden warmth not a gradual build up. Now... for people who use substrate for them to burrow, you may be pulling a frog out of substrate that's 70 degrees in a tank thats air is 80, throw them into a 15-20 degree different water may shock them. This is just how I think of it.. I haven't had any ill effect and I am happy with the results.

Grif is the first one to tell me to use lukewarm water but I didn't get a exact temp from him at first, so I assumed 85ish. I tried it and it worked. I've been using that temp since, I didn't find out what he considered lukewarm until months after.. I just haven't changed my ways because it's worked and I've had no hinderance to my frogs.