You saw some hole like indentations in your multch around your plants and wondered what it was you got your shovel and dug a hole where the indentation was and found a frog about 9 under ground Why?

Well, if it was in winter, they were probably trying to hybernate, same with fall, if it was in summer or spring, it might have been a male that dug to amplify his croaks, or fleeing from a predator. Signed, Kaguya Kaze