Thanks.
So, for other who are curious. TamaGo is focused on certain ARM SoCs. So CPUs rather than microcontrollers. TamaGo is more or less a fully fledged go running on bare metal.
Pretty cool, actually.
Also there's gokrazy[0]: "a pure-Go userland for your Raspberry Pi 3 or 4 appliances"
I'm sure there are more differences.
Edit: They answer the question in their faq https://github.com/f-secure-foundry/tamago/wiki/Frequently-A...