No no no no no!. A Ferrite bead will ADD inductance. For the digital side you want to keep power supply loop inductance as low as possible.
Yes, join grounds only at one place. By a TestLoop I mean a loop of tinned copper wire soldered into two pads about 150mil apart. It makes a good test point to hang a scope or meter lead on, and, as far as your PCB and Schematic program is concerned each side of that point is a different net. If one side is DGND and the other side is AGND, then that is your star point and you have fooled the program into thinking your grounds are not joined. If you join them you will get an error or worse still, they (AGND and DGND) will be routed as the same net.
Git