Mercer Mayer is an American children's author and illustrator. He has published over 300 books, using a wide range of illustrative styles. Mayer is best known for his Little Critter and Little Monster series of books.
There are six books in the "A Boy, A Dog, and A Frog" series. These "pictures only" books are simplistic, but kids can use their own words to tell the stories. The artwork reminds me of Maurice Sendek, who I love.
I was going through a box the other day and found this little box of frogs. This is a delightful collection for kids of all ages. I remember pulling these out as I was growing up and flipping through the pages.