DBlue crusher is a free plugin that works in Audacity on Windows
it can do stereotypical retro video game effects …
In your case for the croaky effect (without bit-crush) try these settings …
Jeroen Breebaart’s time-machine is a similar free plugin, (again windows only) …
That’s a full-strength time-machine example, you can adjust to taste, e.g. only slightly computery.