As Scaldart said, I’m unfamiliar with Dickman, so thank you for linking an example! It’ll be a fun read this evening , along with some other new recommendations I’ve gotten here already!
Regarding Shel Silverstein: I think he deserves a lot more credit than he seems to get (at least in my experience). He’s a great balance of accessible to young audiences without becoming too ridiculous or grating. Personally I think he had a great talent. As a fun side note, I learned during a recent Wikipedia rabbit hole descent that he wrote the lyrics to Johnny Cash’s A Boy Named Sue!