Flinds are much more powerful variants of the common Gnoll found in Baldur's Gate. They're distinguishable from their brethren by way of their dark blue-ish skin-tone. They also noteably wield Two-handed Swords, as opposed to the common Halberd, which they are particularly skilled with.
They cast weapon entanglement with each successful hit, which gives +4 penalty to THAC0, unless a successful save vs wands is performed that stacks. It's easy to miss due to lack of feedback on a successful throw in Dialogue Window.
- Flind article at the Forgotten Realms Wiki, a wiki for the medieval fantasy universe named the Forgotten Realms.