Draft ewes: need moving off very rough grazing onto something better - ie off moorland onto pasture.
Hoggs - lambs born last season - also called old seasons lambs. In Scotland, lambs born in March/April turn into Hoggs on the 1st Jan.
Stores (any type) - sheep to be grown on for slaughter - not bred for breeding...
Each area of the country seems to have their own terms for the same beast, can make it confusing at times.
Not sure about couples, sorry
Sue