Yes they´re popular here... but the name of that food is not "hot dog"; here it´s called "pancho"
I´m argentinian and I don´t like to eat asado with chimichurri or choripanes every week or even every month ¿Do you think we eat only asado with chimichurri and choripanes? lol, too much fat for my taste... I eat choripanes only sometimes, but I can eat a pancho every week if I want ´cause it´s easy to cook (specially for a single man that hate to cook)and with less fat...