GW has produced several large scale models of Trolls, the Staff 2004 Christmas Gift, the Forge World Statue and the, not actually large scale, but huge, Giant River Troll Hag.
The Troll Hag, the Stone Troll and the Epic Chaos Troll are shown for size comparisons.
Sculptor:
Various
Painter:
Various
Source:
Orclord
Released:
Various
Large Scale Trolls
Forgeworld Stone Troll Statue
Staff Christmas Gift 2004 Troll