When Twister is in Candleford selling nuts, he is yelling "Basellonies big as ponies." He is mispronouncing "Barcelonas," referring to "Barcelona nuts"--a type of large hazelnut that grows in Spain. (And he is no more selling Barcelona nuts than they are as big as ponies. Presumably Queenie picked some local hazelnuts and Twister is exaggerating in every way).