Chipping or what is commonly known as "jump shot" in snooker is forbidden.
A jump shot is made when the cue-ball passes over any part of an object ball, whether touching it in the process or not, except:
when the cue-ball first strikes one object ball and then jumps over another ball;
when the cue-ball jumps and strikes an object ball, but does not land on the far side of that ball;
when, after striking an object ball lawfully, the cue-ball jumps over that ball after hitting a cushion or another ball
See a pdf page of the Official Rules of the Games of Snooker and English Billiards.
Play better snooker, learn one to one or online. Get coaching, tips, training and lessons from former world champion and leading coach Terry Griffiths at Terrygriffithssnooker.com.