If your young students want to read a book with some subtle humor, then I recommend this classic by Minarik (author of the Little Bear series). Some things just never go out of style.
Look carefully at the cover art. Two young children (Rosa and Willy) keep snipping at each other. Their older cousin Joan keeps telling them to settle down, to no avail. Joan finally teaches the two youngsters by telling them a humorous story about two naughty baby alligators (do you see the baby alligators in the cover art?). Readers will delight with the parallelism in the story.
This book is ideal for independent reading for young readers. It has simple language and cute illustrations. I always get a warm and fuzzy feeling when I read this book.