thisp age is rough notes
Some sort of flesh and meat type being, not a goblin. Sentient. Soul-bearing.
Live under bridges, build bridges, engineer bridges, obsessively calculate costs and tolls, these guys are crazy about bridges, can't get enough of them.
Troll populations out of control can result in areas with an excess of bridges, there are cities and civilizations lost to history, simply crushed and buried under bridges built and layered until there was nothing left to connect and no one left to pay a toll. Effective troll management is key, properly cared for populations of bridge trolls can make for an organic network of bridges across a wide area.
something about bridge troll mafia collusion or something