- last post: 01.01.0001 12:00 AM PDT
I don't think so. Mainly because the Flood broke out of the prison-like installation (with some accidental help from the Covenant) so there simply wasn't enough time to do anything like that.
They simply attack other species, take over their bodies. Did you notice that when you first meet the flood you first see the infection spores, then you see combat forms and then combat forms with weapons?
This is because they are intelliegent in the sense that they have a huge learning curve using experience. They pick up stuff easily which makes them get progressively more wary of their surroundings (weapons and ship repair just some of the examples). They really want to get off Halo and realise that the bodies they have taken over must have got on the ring somehow. So they find the ships and try to repair them.
Obviously, if any flood actually made it off the installation in Halo they would be more intelliegent than ones stuck on other installations with no outside interferance. The flood developing weapons would most likely only come from any surviving flood or flood that have being interferred with.