I've just done that very thing. I keep it in a large zip lock bag as carving is much easier when green and the bags lengthens the time it is like that.
I didn't leave enough thickness around the edges and it did split a little - so I start to apply veg or olive oil before it is fully dry to allow them to 'swap over' so the wood never really dries out, and they are non-toxic. It does mean, however that sanding smooth when still a little green is heavy on the glass paper and hard work.
Some idiot has gone around my woods playing with a new axe or something, so I have loads of wood to work, had to buy more sandwich bags.