Nini's Treehouse is a TV series that lasted from 2000-2003, produced by The Itsy Bitsy Entertainment Company (better known for their involvement in Teletubbies). According to outside sources, it was a British-American co-production.
As of right now, only some episodes from the Arabic dub and the Hindi dub have been found.
As I found 2 of the found episodes of Nini's Treehouse that has the english version.