Of course they do. People hoard any time they expect the price to go up — even the most unregulated markets have speculators.

You also hoard whenever goods have storage costs associated with them and you have excess capacity. Hoarding is how you collect rent on your grain silos, warehouses, freezers, oil tanks, etc. You either hoard yourself, or you contract out the capacity to others who want to speculate without the capital expense of building their own storage.