It is tux rider, though. You can dind the extreme tux racer for android in Github. you can download it from the releases. You can download it here.
There is already an F-droid application for Tux Racer. You can find it here
Could you remove beastie. It is very offensive for some people. Please remove the character
Sadly, the version you are referring to is an individual app. It is not made by the actual team. I asked the app's owner for source code, but he wouldn't give it. Since, he hesitates to give the source code, I doubt that there will be an F-droid version. However, anyone can make an open source android port for this game. The playstore version is actually different, it has no source code and it is paid too.