The Crocodile Army was a force of Crocodiles led by Rong, the Crocodile General.
In "Wake Me Up Before You Po-Po!", in an effort to take over the Valley of Peace and seize the Jade Palace, General Rong and his army accessed the Mist of Morpheus held within the Swamp of Disillusionment. By pumping this mist into the air, they sought to put all the inhabitants of the valley to sleep, while they themselves were protected by special breathing apparatuses. Their plan was largely successful, but Po and the Furious Five were able to remain awake using their training. After shutting off the Mist of Morpheus, they attacked the marching army and managed to defeat them, saving the valley from their intentions.