Nightbird and Scourge are from several Gen 1 series, along with some others, while Battletrap ONLY appeared in the "Power of the Primes" toyline as two Decepticons combining as one.
Skullcruncher makes NO sense to be aligned with the Maximals, as he is known as Skullsmasher, who was a Decepticon Headmaster from Gen 1, reappearing in Titans Return. Snarlsaber is at least based on the various wolf-like Maximals throughout various Beast Wars media.