You don't know the "barbul" (a type of fish) either?
Spanish: ¿(Tú) (no) has conocido/visto el barbul tampoco?
Comment:
In this example, tampoko is not accompanied by nu. Equally felicitous would have been: ¿Bo a konosé babbú tampoko nu? OR: ¿Bo nu a konosé babbú tampoko nu?