I hope that your snake does ok, but I can honeslty say I've lost a western hognose to just the same thing. She ingested some aspen while feeding and later developed some sort of blockage or something that eventually killed her.
That's why I don't use any substrates that can not be safely, accidentally ingested. Sorry to be gloom and doom on this one....it may also pass with no worries, but I wouldn't feed him in his tank again.
Roy