The staple veg for bearded dragons should be spring greens, because they are high in calcium.
I would imagine that rocket would be too strong a flavour for them, a bit too peppery.
Try grated cucumber, carrot and butternut squash too.

I feed locusts as I find them better than crickets in most ways, apart from cost.
Feed as many locusts they will eat in a few minutes.

How old is your Beardie?