Mixture of novels, short story collections, and picture books. There are steadfast claims than none of them are ghosted. The difference between Walliams and Dahl is quantity over quality - more titles selling far fewer copies each.From the DM ‘The children's author has published more than 40 works’ - his first children’s book was published in 2008. How on earth has he managed to keep up standards and publish 40 in an 18 year period? He must be pumping out 2-3 books a year? Roald Dahl only published around 20 children’s books in about 46 years!