Another Lisp variant:
(define (chunky li sz [str ""])
(let ([graft (lambda (s l)
(string-append s (string-join l " ") "\n"))])
(if [<= (length li) sz]
(graft str li)
(let-values ([(x y) (split-at li sz)])
(chunky y sz (graft str x))))))
(display (chunky '("a" "bb" "c" "d" "e" "f" "g" "h") 3))
+% mzscheme chunky.ss
a bb c
d e f
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