Not really. Neither during Alexander's time or later - at least as far as I understand it. O'Etairos knows more about Makedonia than I do, but the peltastai were an Antigonid development that derived from phalangites operating in roles other than the phalanx. It became a permanent unit and replaced the hypaspistai on the battlefield. In Makdonia, the hypaspistai were bodyguards and personal enforcers of the king. The argyraspides were veteran phalangites (and said to be formed by a core of hypaspistai and hence my toughts on the difference of equipment between the hypaspistai and agema) in Alexander's time, and probably the sons of military settlers during the Seleukid era.

Are you talking about the Antigonids or the Seleukids or Alexander?