Yes, but candy is difficult to make if you do not know what you are doing. Try making a simple syrup with some lemongrass leaves. You can then use the infused simple syrup to put in the candy.
If it is something small like Skittles or M&Ms, certainly! Just be warned that it won't pop as well as confetti. If you don't have confetti, then you can cut...
Several sources say that fresh lemongrass can make broths too bitter, but the muted flavor of dried leaves might have less punch. Another thought is to use the fresh leaves...