The series has edited together multiple episodes into 45min-to-an-hour specials – not the longer DVDs they release with several thematic episodes, but a single story aired originally in the longer format on TV, and available on streaming, e.g. https://www.amazon.com/Daniel-Tigers-Neighborhood-Tiger-Family/dp/B0713WM5WQ

I've included the two I know of as episode groups, but should they be specials on their own? I imagine the just-aired "Daniel Tiger Movie" may be similarly broken up into episodes (I've listed it as a season 0 special for now).