I looked it up and a lot of words that mean "trick" come back so I'm sure which is the right one.
Sports games for the exhibition of tricks is called
Question Overflow made a good point.
招式 is often used for 'tricks' in sports like skateboarding - so in theory it should work with snowboarding just the same. You can even shorten it to just 招 if you'd like -- might sound a bit kung-foo-y though...
edit: some extra info:
see this article
the article talks, mainly, about ski + snowboard tricks the article features the word 招式 a lot：