Off the top of my head,here's some ways of strengthening your forearms/grip/wrist:
-In the gym use a thick grip on the bars,for example wrap a towel around your pull up bar,tape or use a small towel around the bar bit of a dumbell or barbell.
-The farmers carry,whereby you carry a very heavy set of dumbells until you can't grip anymore.
-Hang from a bar for as long as your grip will let you.
-Wrist extensions with a barbell or dumbell,where you sit with your forearms resting on your thighs,and hold the barbell/dumbell with an underhand grip and curl it towards you,then use an overhand grip to work the other side of the forearm.
-Hammer curls are great for thickening up your forearms,and when doing alternate dumbell curls you can twist the dumbell more at the top of the rep to work the wrist.
-You can also buy grippers and a wrist extension thing which apparantly helps with tennis etc,and then there's that gyro ball thing(never used it myself),but to be perfectly honest you'll most likely get the grippers,use them for a week or two then just forget about them).
-You can also try contracting your wrists at the end of a press up,or do press ups on clenched fists instead of open palms.Hitting a heavy bag should also strengthen your wrists up.
Personally,I didn't realise my forearms were holding me back in some exercises until I joined a gym which had thicker bars on their dumbells:When doing alternate curls I found that my forearms and grip was completely exhausted before my biceps were,and consequently I couldn't reach failure on my biceps because my grip would go early on.So for me,the best thing to do is do alternate curls with thick grip dumbells,and pull ups with a thick grip.Bit of an essay but there you go im bored
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