No, his books are not available in the iBooks format, nor for Kindle or Nook.
The best bet is to go to Amazon's website and locate one of Dahl's books. Below the cover image, you'll see a link to let the publisher know you'd like it made available as an e-book. Given Amazon's popularity and clout, if enough people do this, the publisher will get the message! If Amazon offers it eventually for the Kindle, you'd be able to read it using the Kindle app for iPad/iPhone.
Roald Dahl's most famous book is called " Charlie and the Chocolate Factory " And this is the second book of Roald Dahl.
Roald Dahl started writing when he was three .Roald Dahl's first book, The Gremlins, was published in 1943.
James and the Giant Peach by Roald Dahl
The big friendly giant was Roald Dahl's favourite book he wrote.
Roald Dahl's Book of Ghost Stories was created in 1983.
There are approximately 25,000 words in Roald Dahl's book "The Witches."
Roald Dahl's last published work was Roald Dahl: Collected Stories - circa 2006
Roald Dahl, author of the book "Charlie and the Chocolate Factory"
Roald Dahls daughter Ophelia wrote a book about him after he died called The Roald Dahl Treasury which was about his life
Roald Dahl wrote a book about himself in his childhood named BOY.
The BFG is a children's book written by Roald Dahl.
Roald Dahl's favourite book is the famous five.