if your asking why they have no skill in mining they from what I remember they were more tribal and focuesed on hunting and bought things from the blackrock if its about buying not sure the frostwolves want to get involved with others and the others might not want to sell to an orc
Basically.
THe Frostwolves have this whole thing about living with nature, respecting the natural world, and so on. I don't see them doing any mining, an inherantly destructive method of acquiring resources.
I'm not saying it's impossible for them to mine, but that it's not possible for them to get the resources they need without doing so. Comparably, the Dwarves are dwarves, and mine all the time, so can trade for other stuff.
As for trade, the Frostwolves spent ages in isolation. Either they killed everyone around them or they just don't do much trading. Presumably also ocne the Second War was over, the Frostwolves were as hated as any orcs were, so no one would be willing to trade with them apart from criminals etc, who Drek'Thar wouldn't be dealing with. Who would he even trade with? He was surrounded by the Scourge to his north, the Wildhammer to his east, the Syndicate and then the Stormpike to his west, trolls to the south, and Southshore to the further south. His only ally is the Forsaken, who've never really been the best allies.
In this quest I've had them trading with Hammerfall whcih serves as a little production hub etc, but the Frostwolves themselves are hardly trading in bulk.
So a mixture of culture, regional situation, and technology holds them back, making them significantly less secure than the Stormpike yea