Hey Cecil I do not really have any crops close by, The nearest is about a mile away and we have had know rain to wash anything in. I was wondering about disease but have not found any dead frogs whatsoever. We have plenty of live frogs everywhere and I was thinking that if it was a disease it would most likely be affecting the frogs the same as the tadpoles. The tad poles that have been dead awhile are a bluish color. I saw several frogs tonight while fishing and did not notice anything unusual about them.