The Alligator Robot appeared in season 1 of 2002 TV series called Samurai Jack. The alligator robots were a group of bounty hunters featured in "Jack and the Scotsman, Part 1." They were easily defeated by Jack's swordsmanship and the Scotsman's brute strength and machine gun leg.
It is unknown how the past Aku's destruction affected their existence, though it's likely they were never built.