You're actually talking about a pretty rare piece of animation history. Jungle Jim's had a super short run and wasn't widely syndicated which means not much of it exists out there. Your best bet is contacting animation collectors or checking out animation forums beyond Reddit. There are a few dedicated …

hey! you might be thinking of The Magic Tree House show!!! it was from the books with the same name. Jack and Annie were the kids, and they had a treehouse that let them time travel. awesome show!