Daniel Tiger's Neighborhood is an American-Canadian children’s animated TV series created by Angela C. Santomero in 2012 and is still running to this day! The show is a spin-off series to Mister Rogers' Neighborhood. However, there was a pilot made sometime around 2006-2008 that is currently lost. The only proof of its existing is an archival article about the pilot. There's concept art in https://astridriemer.com/work/animation-design. PBS kids picked up the show back in 2012. again, it's possible that there is a second pilot but there's no photos to confirm it.
References[]
https://www.animationmagazine.net/2012/10/a-tiger-cub-gets-his-own-show/