Having read the book Dealers of Lightning about Xerox PARC and Kay,I think Smalltalk 72 was the original smaller simple language, with which children were taught.
Then others at Xerox added more professional stuff, the kind programmers would want, which resulted in Smalltalk 76 and so on. These were not as approachable for children anymore allegedly.
Nowadays there's Squeak which is a Smalltalk implementation, which influenced Scratch I think (first version of Scratch was written in Squeak).
Search the internet for Adam Kay's documents on Squeak and educating children, helps to put on context what he had in mind (if you, like me, just install Squeak and expect a stunning tutorial... it's not like that, at least I didn't find).
Kay also said, having an IDE only takes you to the 70s from the 60s too... So there's work to be done yet.
There's even a pretty fun documentary on the Squeak project, with Seymour Papert, Alan, and Jerome Bruner. [0] Or, if you want to go further back, read the original "Personal Dynamic Media" papers.
I just wish these languages preserved their sense of ingenuity and wonder, before putting on the iron maidens of their frameworks.
I wish there was a C for children, but explaining indirect addressing and the evolution of indexed pointers is a bridge too far.