Google translate for Yiddish is a waste of time because of its many inaccuracies.
Children’s books with nekidos that you are familiar with the story will probably be easier than just taking any kid’s book off the shelf. Even better is if you can get your hands on both the Hebrew and Yiddish version of the same book. (Machanayim books come to mind first, but it’s not really modern Yiddish.)
Check local bookstores; many illustrated, short-story (about 15 page) Yiddish books are printed in E. Yisroel and I believe are actually translated from Hebrew to Yiddish. You’d need a store that carries both versions, or check for Yiddish versions of books you have at home.
Good luck!