The other Famous Forty authors don't do anything with Kalidahs, as far as I can recall, but they do show up in several apocryphal works. The Eric Shanower story that I mentioned yesterday, "Gugu and the Kalidahs," obviously includes the creatures, and Gugu has a conversation with their king (who, while mentioned in Magic, doesn't actually appear in the canon). An Oz manuscript that I've written in rough draft form also includes the Kalidah King, as does Atticus Gannaway's Time Travelling. But one of my favorite post-FF uses of Kalidahs is Phyllis Ann Karr's "The Guardian Dove," which describes their culture in some detail, and introduces Kericot the Considerate Kalidah. It's rare for Oziana characters to reappear in later works, but Kericot and her friends are exceptions, showing up in Karr's own Maybe the Miffin and illustrator Melody Grandy's Thorns and Private Files. Coincidentally enough, a picture of Kericot and her brother Randicot appears in S.P. Maldonado's latest post.
I don't think there's ever been a consensus on how to pronounce the word "Kalidah," but as my post title suggests, I've always pronounced it like the beginning of "kaleidoscope." Jack Snow agrees, and even posits that L. Frank Baum might have derived the name of his wild species from that of the device. But I've heard it said on other ways as well, and I'm not aware of any statement from Baum on the correct pronunciation. For any Oz fans reading this, how do you usually pronounce the word?