Leto had turned the Lycian peasants into frogs

Leto was compelled to leave Delos after giving birth and travel to Lycia with her kids. She was searching for some fresh water after a long journey when she spotted a clear pool of water in the distance where many of her fellow people were picking reeds, osiers, and bulrush. The people forbade her as she tried to approach the pool to get some water from it. Even worse, they posed a hazard of contaminating the crystal-clear water with their unkempt hands and feet. Additionally, they brought their livestock to the spring so they could get water. She was unwanted, and they wanted her to leave.

Leto felt enraged at this point and raised her hands to heaven, cursing the peasants to become tethered to this river. Since then, the dumb frogs have been muddying the pools in which they jump and dive.