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The robot crocodiles were devised by The Shredder to infiltrate the sewers and find the Turtle Lair, detonating the bombs within them to kill the Hero Turtles and Splinter.
The first one gets the drop on Leonardo, Michelangelo, Raphael, and Splinter and knocks them for a loop. Fortunately, Donatello and April, who were being held captive in the Technodrome, slapped together a makeshift radio and were able to alert the others of the additional crocodiles heading their way. Leo, Raph, Mike, and Splinter made short work of these threats.