Don´t expect too much from the troglodon. The scream is nice if you have many units that benefit from it. The thing with the troglodon is that it´s a big beasty, and therefore it´s a cannonball magnet. You can use it that way, so your more capable units don´t get shot for one or two turns.
If your opponent´s heard how the troglodon does in game (not very well) he might as well ignore it and you could do something interesting with it.
If it´s a fun game I´d include the troglodon, but if it´s competitive I´d try to avoid it
It´s a shame that the rules in 8th are so bad for such a beautiful model