Officially the set is known as 75167 Bounty Hunters Speeder Bike Battle Pack. It was said that the Speeder Bike is just a compliment for the set, because the consumers are actually paying to buy the figures. But i believe not every Star Wars fan can recognize all the characters from the set.
The 4 characters from the set are: Bossk, Dengar, IG-88 and 4-Lom.
They have their own little story around if you google it. But all these are unique characters that they are not the ordinary ‘pawn’ like Rebel Troopers or Stormtroopers.
Below i try to identify the characters and compare to the 75167 set: