I made it in 2010: https://bitbucket.org/yiyus/ngaro/src

As I said in another comment, it won't work now because Go had not yet reached 1.0 at that time, but it should be easy to get it working again.

Not exactly Forth, but I implemented a small branchless Forth-like language in Go for audio synthesis and music:

https://github.com/boomlinde/acidforth

I think entirely procedural languages are a nice fit for this domain since they make order of operations apparent. Going for something Forth-like was obvious, since it's terse, trivial to implement and makes factoring easy.

That said, I think the documentation of this project is a bit out of date, that the overall architecture is flawed and that stack juggling can be a bit distracting when working with more complex algorithms. I intend to rewrite it some day.

I've always thought Haskell and Forth would make an amazing combo.

I've implemented forth a few times, most recently in perl.

I have a couple of forth-implementations in golang bookmarked. As a quick example take this one:

     $ go get github.com/unixdj/forego
     $ echo '3 4 + dup * . ' | forego 2>/dev/null
     49 ok

ForthGo?

Sounds like it isn't that good if it took them four tries.

What makes you think Go and Forth go well together?

This is not getting enough up votes.