They're these thirteen 2.5 x 3.5" cardboard character cards by Tyco - they have a picture of the character and three Fun Facts about each one. If you search "Sesame Street" + "Tyco" + "Fun Facts" on Google, they'll show up.
I intended to get screenshots for the episodes soon after finishing their guides, but I just hadn't been able to get to it and got derailed. I hoped somebody perhaps would help and get the screenshots (and I'm surprised nobody thought of doing it), but if you want to covert them to Noimages, then that's fine.
Understood. Generally speaking, it's probably best to leave image links out unless you have the image ready to go. Otherwise, feel free to use File:noimage.png as with other episode pages that are missing screenshots.
Please direct your attention to some other aspect of the Wiki, please. It's great you're enthusiastic about the Sesame guides, but it's not appropriate to ask for things in this manner. Please be patient.