It reminds me of the time in 1968, I was driving overland to Turkey then a ferrry to Cyprus. We stopped on the Meriç/Maritza river bank and decided to camp for the night. It was hot and dank and we (two drivers were knackered. We were on the Bulgarian side. The following morning at dawn we awoke to this strange cacophony of deafening noise. We jumped up in terror. We were surrounded by millions of frogs croaking like mad. We had children with us, but I dont know who was more scared, us or them.
Obviously we camped in the wrong place and were unhappy about the intrusion. We beat a hasty retreat and god knows how many frogs we crushed to death. Worse than Hitchcocks' 'The birds'.