I feed bml, I use frozen veg unless we are eating a veg they can have for dinner then some fresh veg is reserved for them.
I usually use fresh fruit, I do try to keep a frozen fruit or two in the freezer as a back up or lazy night if I don't feel like cutting up fresh fruit.
If your planning on using tpg, it all gets frozen anyway so frozen or fresh is up to you really. The most important thing with that diet is using their supplement to make it balanced.
I also want to say, I commend you on the questions you have been asking and doing your research in advance to getting your gliders. It sounds like you will be very well prepared for your future gliders!!