Exodus 8:2

Frogs. Frogs were sacred animals to the Egyptians. One of their deities, Heqa, was a frog-headed goddess thought to possess creative power. Though the chief purpose of this plague was to punish the oppressors of Israel, it was also designed to cast contempt upon their many heathen gods. The great multiplication of frogs made the goddess Heqa appear not only ridiculous but even vicious. Here she was, tormenting the very people who professed to be her most ardent devotees. Their religious superstitions obliged the Egyptians to respect the creatures they now loathed and hated and would otherwise have destroyed.