Most Japanese programming is done in Western languages; Ruby was developed in Japan, but uses English keywords and the "function()" style.
There is Dolittle, which uses Japanese keywords and is postfix. It was inspired by LISP, which is also postfixLOGO. There's a whole category of stack-based languages (FORTH, Postscript etc) which work as you describe, but they have never become popular compared to ALGOL-derived verb-object languages.