Hide Daedroth from Maw of the Infernal
 

Is there an addon that can hide the Daedroth spawned by Maw of the Infernal?

If not is there an API that would facilitate it if I needed to make my own?

No. The Daedroth is part of a combat skill and the 3d world, as such addons can and must not interfere with it by design. Why would you even want to hide it in the first place? It's kind of important to see it, since it can kill you (in pvp at least).

I have not tested it myself, but you could check to see if the Hidegroup addon also hides the daedroth when you're in a group with the player who spawned it.