Looks like they don't work too well. The croc can come with either the blue or gray half-pin. It's only displaying one of the alternatives on the assembly page (1), and when clicking through to the dark green croc page it doesn't show the alternatives at all (2).
(1)
http://www.brickowl.com/catalog/lego-crocodile(2)
http://www.brickowl.com/catalog/lego-dark-green-crocodile
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