A "staghorn" is the general growth formation of a colony that produces growth like "antlers". There are many different descriptors used, as well those for corralites.
growth forms can include: encrustings, arborescent, Coliminar, laminar, Explanate, etc.... (my memory isn't that good I am quoting from JEN Vernon's "Corals of the World" and suggest this source for further clarification and confusion).
Within the genus Acropora lies like 200 different species, one of these species is Acropora Tortuosa (Tort). They can morph due to enviromental and flow factors......and can be hard to determine especially when frags.
Sorry, I am going to pass on guessing what this is right now.....a little too small......but a Tort tends to be considered a Staghorn.