End of the Flies by Russ Crossley

Rusty T. Quits, lazy, misogynist, and too-much-TV guy faces a very real problem when his wife turns into a frog. He soon learns all the women in Seattle have inexplicably turned into frogs. Armageddon arrives with a burp!

Reluctantly he sets off on a quest to save his wife, and the world, from a magical spell so devious it just plain hurts. Will it be the end of the flies?