That would be tricky, since you can't give too many treats, and also it would depend on what you are trying to train. It can be done, I've never bothered to try myself, but I've heard of and see people doing minor tricks like spin around, come, touch a target, or even go back to the cage. However chinchillas don't think the same way as a dog, which tend to do thing to please you, they are more like cats, they don't care too much if they please you they think more along the lines of "why? what is in it for me?" so I'm not sure you would ever be able to space out (go a few clicks between giving a treat) or remove the treats from the equation like you can with a dog. It also means if you don't have a high enough value treat they may not cooperate, and high value treats tend to be the more "junk food" type ones, which you need to ration the most, lol.