Any one remember the TV show with a mail section with a puppet with a square head and he was behind a counter? They would show mail sent in from children. It was called the mail corner or something? Please help!

Blues Clues
Gula Gula Island
Mister Rogers

Lol I asked the same question just last week! ( see? https://www.askmehelpdesk.com/television/does-anyone-remember-90s-pbs-show-596402.html )... so far, without any luck. I'm not finding anything about this show anywhere! Weird!

My son says Pee Wee's Playhouse.

Pee-wee's Playhouse - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Pee-wee%27s_Playhouse#Puppet_and_object_characters)

Or check this --

http://en.wikipedia.org/wiki/Template:PBSKids_shows

I may have answered it here:
https://www.askmehelpdesk.com/television/does-anyone-remember-90s-pbs-show-596402.html
(maybe... )

Holy crap! I was just looking for this too! That blue box head dude with his swirly eyes and growing neck was the scariest thing I ever saw as a child. Now I want to see him again..