I watched 2 episodes so far but this show looks like writers took Black Sails script and changed pirates to trappers.

(minor spoilers from Black Sails and Frontier but nothing that could spoil the fun)
In both shows young, an inexperienced boy comes to the new world (different regions), meets the legendary outlaw and after some time gains his trust. The outlaws are grouped in companies/crews and rival with themselves, but there is greater enemy - Hudson Bay Company/The British Navy. On island/in fort there is tavern ruled by a courageous woman. Most important trapper/pirate is played by charismatic actor [spoiler]and has great problems with the government because of the woman. He also wants combine forces of all smaller companies/crews to beat the common enemy, but others don't see the need for it (besides the young boy, who is really smart).[/spoiler]

Nevertheless, the show isn't bad and as far as I watched (for two episodes of both shows) I think that Frontier is slightly better. I'm little worried that the moment I don't see as many likable characters as in Black Sails, but maybe after few episodes (I watched 3 seasons of the pirate saga), I will find them more interesting.