NEW YORK — Score one for the preppies. Whether you correctly identify the Lacoste emblem as a crocodile or call it an alligator, the icon will grace the house’s first American fragrance, due this fall. Lacoste Pour Homme begins rolling out in October to about 2,000 department and specialty store doors. Industry sources estimate that it could do $25 million or more at retail in its first year on counter. For more, see page 6.