Sorry to say that word ?llendo? is not recognized by RAE or any other spanish academic authority (specially in Latinamerica). Mainly because the proper word should be ?yendo?, since verb ?ir? is irregular therefore gerund with ?i? is replaced for ?y?.
Synonyms of llendo are trasladando dirigiendo viajando desplazando
Used in US as well
"Estoy YENDO a la escuela."