There's an app or online tool that i just love, but the name escapes me.
Say you set students a topic to talk about - in my instance i may want students to investigate a certain classical composers and present back their findings. But you type in your topic and the computer randomly decides you have to talk about this topic "as a dance" or "as a mini play"
Starting something like this at the youngest age possible would firstly break down anxieties of speaking in front of their class and secondly be a fun way to not only do the research, but figure out how you are going to perform your findings.
A firm favourite of mine..... if only i could remember the name of it.