No. You can keep 1 oscar in a 75 and that's it.
I don't know a great deal about Dats but i've seen a 22" one before and that won't be able to turn around in a 75 gallon.
I had an NTT (one of the smaller growing dats) and an Oscar that was approx 8 months old in a 4'x2'x2' 120 gallon and they maxed out that tank in my opinion.