[Folwren]

I would say likely not - probably for the same reasons that Inziladun stated. The examples of his handling of Pippin in Moria and after the incident with the Palantir are good examples of what he'd likely do in a case of 'anger and frustration'. These two occasions, wherein Pippin acted out of foolish curiosity and without any maturity or self-control, are likely the most deservant of any sort of beating, and yet Gandalf did not. In Moria, he did reward Pippin for his actions by making him stand first watch - and when doing so, let him know that he was displeased with him.

Gandalf is probably wise enough to realize that such punishment would not really be effective. Spanking/beating anyone never does any good if done in a temper. Often times, I've noticed, he was mainly angry because he was frightened. In any other situation, I imagine he'd be amused.

I think his idea was 'the punishment shall fit the crime.' So...Pippin was badly, badly frightened when he looked at the palantir. He learned his lesson, enough said. Pippin caused the Fellowship's presence to be made known in Moria, so he stands first watch to be haunted by his own fears. Sam eavesdropped on Frodo and Gandalf while talking about important matters that had to be kept secret, so he has to go with Frodo to make sure he doesn't talk!