Doug Sloan hath spoken
There's been some debate on Trent's DinoGem power, since he appears from a wall in "Burning at Both Ends" and a bank of lockers in "The Missing Bone". Well, it looks like Doug Sloan's posted on Rangerboard about the issue, settling what Trent's power is.
He's a chameleon. He wasn't standing in the wall/the lockers, he was leaning against them.
In any case, a power you don't want an evil Ranger to have....