An example of argot is pig latin.
Origin of argotFr, origin, originally (in thieves' jargon), the company of beggars (argoter, to beg, probably from ergot, claw, spur, hence origin, originally , “get one's claws into”)
Origin of argotFrench from earlier argot underworld of beggars and thieves of unknown origin
Usage Note: The pronunciation of argot as (är′gət) was long considered acceptable and has historically been included in most dictionaries. However, it is falling out of favor; in our 2005 survey, 75 percent of the Usage Panel found that pronunciation unacceptable.