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There's a hay cart. And there are also 2 or 3 hay beds, which if you clip through the wall when you place, you can probably make look like a pile of hay. But I don't think there is specifically a pile of hay.
ETA: There is also a Trough. Although the description says it is "full", it is actually empty, so it might be worth seeing if you can clip the hay bed through this into the floor or wall the trough is against, to try and make it look like the trough has hay in it. I have never tried this though so don't know if it's plausible.
Would be nice if each character can set up a hay bundle at the stables and pay in advanced without having to keep relogging each char over and over, so if you paid for 50 skill points in the hay bundle it would automatically feed your mounts on that character automatically right after the 1d recharge.
But If you decided to get crown skills and have no need for the extra skill points you invested with the hay bundle you could ask the stable guy for a refund for the remaining stored skill points.