You should never let a frog aestivate, unless you know what you are doing and prepare him accordingly. You should monitor humidity and temps and keep them where they need to be throuout the year. They do sleep, but is not actual aestivation.
i suggest you make sure your husbandry of correct, as for frog - place him in a warm water bath, not too deep, just enough for him to sit with so the head is not submerged. He should perk out.