Stupid question, I lost my horse from the Solitude stables and my Armoured Troll while attacking the Thalmor Embassy. At the stables there is only one horse and back at Fort Dawnguard I think there would be two Trolls left. Will the amount respawn so there will be two horses and three Trolls again?

Horses will , my horse died and after a few days when I came back to the stables there was a new one for sale.

Arvak FTW

I would think so