Access: Area to park right next to Kongehøjen ved Voldstedlund. We didn't have time to go up to or into Ormhøj or Jordhøj. It looks like a walk of a few hundred metres back along the road would be the best approach, but you may be able to reach them from Rishøj.
To be honest, I hadn't realised they were so close to Kongehøjen ved Voldstedlund until we were heading away. How I missed spotting them from Rishøj, I don't know, but it was probably too late by then!
So if you're lucky enough to visit, the only information I've found is that Ormhøj has an oval chamber 5 meters long with a rare smaller chamber behind it. Excavated in the 1890s, finds of earthenware post and flint knives are in the Danish National Museum (Copenhagen).