Crazy Manny's is a store run by a man who goes by the same name. In the 2003 TV series episode The Unconvincing Turtle Titan, Dr. Malignus used a drone to brainwash him into robbing his own store. Michelangelo snapped him out of his mania before he could successfully make off with the money.
In the episode The Golden Puck, it's mentioned that he also owns "Crazy Manny's Winter Wonderland Depot" where he sells snowmobiles.
In Past and Present, he is revealed to have a meat shop called Manny's Meat in Northern Manhattan. It has bad moldy meat in the back causing Raphael to be disgusted.