Nickelodeon Poland is now airing a Polish-dubbed version of Oobi! It's called "RÄ…czusie" which roughly translates to "little hands" in English. According to their website, it debuted on July 19 and is airing every Sunday.
This news article talks a bit about it. Apparently, Nickelodeon Poland shows the episodes without a channel logo in the corner. Maybe that's common over there, but I've never seen that before.
The studio that dubbed the voices is called Start International Poland. I wonder why they're dubbing it now when most of the other countries did their dubs of Oobi a few years ago. Maybe it was hard for them to translate the super-simple "Oobi speak" into Polish? Or wouldn't that make it easier to translate? I don't know, it's just great that the Poles are able to share Oobi with their kids!!