Here are some forearm exercises that I like to use when targetting that area:
Palms-Up Barbell or Dumbell Wrist Curl Over A Bench
Seated One-Arm Dumbbell Palms-Down Wrist Curl
also, this next one is a nice one to do in between switching from your bicep workout to your forearm workout because it works both of them nicely:
Reverse Barbell Curl
