Asgard or Asgards?

[Gate-builder]

I am pretty sure that the word 'Asgard' refers to both a single Asgard and a group of Asgard, in the same way that the word 'Sheep' can mean either a single sheep or a group of sheep.
Why then do we suddenly have McKay and Daniel talking about 'Asgards' in this episode? I am pretty sure in all the years the Asgard have been on both SG-1 and Atlantis, we have never heard the word 'Asgards' before. Whats going on?

[Lindbergh_Baby]

Because even people that speak the same basic language have different ways of talking.

[Jeffala]

Thor uses "Asgard" as plural several times in "Unending": "Several Asgard...", "Many Asgard..."

I'd chalk this one up to sloppy writing.

[Voxyn]

I never noticed while watching, but you're right to say that it's a mistake to say Asgards.

Almost as annoying as people who spell Asgard as "Asguard".