> Not with map, which requires equal-length arguments.
> You could do the slightly less ugly:
> (map
>     foo
>     lst-A
>     lst-B
>     (range (length lst-A)))

Why not do it this way?

(struct foo (a b c))
(define lst-A '(a b))
(define lst-B '(d e))
(for/list ([a (in-list lst-A)]
           [b (in-list lst-B)]
           [n (in-naturals)])
  (foo a b n))

This seems to be the nicest of the lot.


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