“In Toy Sto­ry, the Lit­tle Green Men appear to be pro­mo­tion­al toys for Piz­za Plan­et, as they wear uni­forms with the restaurant’s logo. They are known for their near-wor­ship of “The Claw,” the claw of the game they are a part of. They also usu­al­ly speak simul­ta­ne­ous­ly.”

Source: http://disney.wikia.com/wiki/Little_Green_Men