ValForth from Valpar was one of the first cross platform FORTH implementations in the Atari ST ecosystem, and it had some clever extensions for games.

https://www.atarimagazines.com/rom/issue1/jumping_forth.php

But like the post mentions, even the 8-bits had FORTH from Elcomp, and books like https://www.atarimania.com/documents/FORTH-on-the-Atari-Lear.... Leo Brodie's "Starting FORTH" is still a great intro.

While we all learned BASIC, these alt languages helped us learn that there actually are radically different metaphors to program the device

Mind expanding to a kid in the 80s!