No, they may just plump them out a bit. The term "trout pout" is used to describe collagen-injected lips, where too much filler has been used, it's almost always used with a negative connotation. It basically means shapeless over-plumped lips which look fake when you smile.
If you have a thin upper lip the only way to go is a lip lift combined with just a little bit of dermal filler. This will create the "rolled up" look while retaining or improving the vermilion curve.