I am a native speaker in German and I can tell you that while all the books you listed are children’s books, they are all quite old, and the words and phrases t

I am a native speaker in German and I can tell you that while all the books you listed are children’s books, they are all quite old, and the words and phrases they use are weird, to say the least. Maybe grab a Lustiges Taschenbuch? They’re available almost everywhere, fun to read also for adults and since they are comics, the accompanying images provide context.