This is a list of all the hedgehog-related books I've found (fiction and non-fiction). I'm sure there's more, I just haven't found them yet. If you know of any others, let me know.
Redwall Series by Brian Jacques
Alice's Adventures in Wonderland by Lewis Carroll (the hedgies were the croquet balls)
Hedgehogs in the Hall by Ben M. Baglio
Jim Hedgehog and the Lonesome Tower by Russell Hoban
Jim Hedgehog's Supernatural Christmas by Russell Hoban
The Tale of Mrs. Tiggy-Winkle by Beatrix Potter
Hazel the Hedgehog by Grandreams Ltd. (no author)
The Happy Hedgehog Band by Martin Waddell
The Hat by Jan Brett
Elijah and Pin-Pin by Raoul Williams
Hedgehog for Breakfast by Ann Turner
Come Here, Little Hedgehog by Tilde Michels
The Winter Hedgehog by Ann and Reg Cartwright
Hedgehog Surprises by Betty Jo Stanovich
Lawrence by Janet Morgan Stoeke
Rabbit's Birthday Kite by Maryann Macdonald
Buckley and Wilberta by Hope Slaughter
Guide to Owning an African Pygmy Hedgehog by Dennis Kelsey-Wood
Hedgehogs: a Complete Pet Owner's Manual by Matthew M. Vriends, Ph. D.
African Pygmy Hedgehogs as Your Pet by Dennis Kelsey-Wood
An Owner's Guide to a Happy Healthy Pet: The Hedgehog by Dawn Wrobel
"Oh, the hedgehog is a fine old beast,
All covered o'er with needles,
Not smooth, oh no, like some I know,
Eels an' fish an' beetles.
Some creatures calls us hedgepigs,
An' others says hedgedogs,
But I do know that frogs is frogs,
An' hedgehogs is hedgehogs!"
~Brian Jacques