Dolphin on Atari 2600

I was chatting on Facebook about the new Intellivision Amico 2019 Trailer and the game at the end of the trailer is a dolphin game. I mentioned that I believe it was Ecco the Dolphin, but a friend also suggested that it might be Activisions 1983 title for the Atari 2600 called Dolphin. I don’t think it is as the creator of the original Ecco game is working with the new Intellivision and I don’t think they will have any Activision licence products. But this got me thinking that I need to check out the Dolphin game for the Atari 2600!