Jizo, Jizou
noun
The ground storehouse refers to a person's name. It may be easier to learn this one reading first because of that. Anyways, this person is Jizo(u), a Bodhisattva, and protector of children.
じぞう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
お地蔵さんの頭がへこんでるよ。
The head of Jizou is dented.