DOM (a french coder) made the code of this one for Atari Inc. Krazy Rex of ST-CNX made the Unicorn Gfx.
I (Alien of ST-CNX) actually also made a version of the Unicorn part with digital sound which ran on the ST. Why? Because I was so unimpressed by the STe I wanted to show it could be done on the Atari ST. It wasn't released, but I made the Froggies main menu around the same time which was released.