NPC macros

Is there a way to have NPC's roll checks/attacks/etc with just the gm seeing what was rolled without having to continually type /gmroll whatever?  

It's the way that you said in your title (make NPC Macros). Using macros you can save it with the /gmroll included so that you just click the 1 macro button to roll the attack and it's included. Wiki docs, <a href="https://wiki.roll20.net/Macros#Creating_and_Editin" rel="nofollow">https://wiki.roll20.net/Macros#Creating_and_Editin</a>...

Some sheets also have an option to whisper PC and/or NPC sheet rolls/macros. &nbsp;5e and PF come to mind.

If you're looking for more space efficiency (and don't feel like making macros for every NPC), I would recommend making an NPC macro that says /w gm [[1d20+?{atk mod|0}]] This will give you in-line rolls (smaller than normal rolls), whispered only to you, and it will prompt you for what bonus you want to add to the roll and automatically add it. Quick, simple, and effective :-) Cheers!