While minted would be the term for coins - yes, they did. As to why, you have to understatement that viking economy was almost in its entirety based on bartering, i.e. trading goods for other goods. Precious metals were of course used, but only by material and weight (usually in the form of hack-silver).

So, except for the few major trading hubs, where coins from foreign trade were sometimes used (but even there, again, value based on their weight), coins played no role in the Viking society before the raids on Britain. After obtaining a) large amounts of coins in the form of the daenegeld (money payed for not attacking) and b) precious materials from plundering, that changed.

With slowly changing to a somewhat more coin-based economy (bartering still was the prime system for day-to-day purchases, of course), they sought to copy a medium they not completely understood, so in the beginning, they simply minted Faksimiles of english coins, the only way they knew how coins should look. Sometimes, those copies looked so similar to english coins even numismatics categorized them as gunienely english, although probably struck in scandinavia.

While that may sound strange, its not the first nor the biggest example of cultures unfamiliar with coins to misunderstand them. The Celts, for example, who served in large numbers in the macedonian armies of Philipp II. and Alexander the great as mercenaries, brought many greek coins back to their homelands. That resulted in a celtic coin culture where for centuries, coins minted through all of (celtic) europe bore bastardized greek motives, primarily Apollon/Alexander.

(I am currently using my phone, i'll add two articles with examples I have in mind in an hour or so. Also, i'm sorry for any german word my Autocorrect snuck in - it was hard enough to make it write "bore" instead of "Bier") Edit: Already found 2 Autocorrect mistakes, added source.