A fair few titles in the early days of gaming were shameless clones of other companies’ work.
Atari’s Frog Pond, a game that ended up not being released because Atari wasn’t willing to spring for a monster 8K cartridge for a “children’s game”, was a clone of Mattel’s Frog Bog for Intellivision (which ended up being ported to 2600 as Frogs and Flies), which in turn was a clone of Sega’s arcade title Frogs.
And they say originality is dead. Well, yes. It appears to have been dead for a very long time indeed! Don’t let that stop you checking out this video, though — and don’t forget to subscribe on YouTube for more.