DTD has one... I want to say between the Chridtmas shop and the store with scrapbooking things.
MK also has a totem or tiki in adventureland between Aladdin and Jungle Cruise. It's not much, but it's wet. I have a pic of my daughter enjoying it "spitting" on her... In torrential rain, lol.
AK has a fountain somewhere in Asia. Not a splash pad but a raised fountain in an alcove (maybe in front of bathrooms?) it splashes to the ground a bit, especially in the wind and seems to invite you to touch it and get wet. Many people do... and I'm not the type to touch fountains if they're "just for pretty" (I would never was my feet in Cinderella's fountain, Dis-ers! Lol)
The leapfrog fountain in Epcot is by far the best! Just watch out for that one pushy kid.