i used to have skinny wrists, which bothered me immensely. now, i still have pretty skinny wrists (there's nothing you can do about them really) but my forearms are much broader than before and, as mentioned, the difference is impressive. i'm glad i don't have thick wrists now tbh.
exercises to increase forearm strength:-
basically anything that involves you carrying large weights-
deadlifts
shrugs
static holds
other more specific ones
barbell curls
db hammer curls
wrist curls (forward and reverse)
loads, so just get into your lifting and you'll be sorted