I feel like traps are like calves in a sense can I hit them more often ?
Traps can be trained with a very short movement ie: a shrug and or statically, like a DL.
The thing to remember that is most important IMO, (just like any other muscle) is that the more focus or effort you give it, the more it will most likely respond and or grow.
Traps are one of those groups, that get hit at the end of a W/O after one is kinda burnt upp from the session and they just mail in a few half arsed sets. If one puts in the effort on the stuff mentioned, they should respond.
Some guys have luck with higher reps 20-30+ and I know guys who do power shrugs with very low reps ie; 3-5. They all seem to work, depending on focus and determination, which will be key.
Since say a shrug is a very short ROM move, it seems it can be trained 2-3 times per week too.