Yes, Pacman frogs are often picky eaters.
My male ornata was hunting all kinds of preys when he was a juvenile (Crickets, red runner roaches, little earthworms).
Now, he is a subadult, and he only hunts nightcrawlers, adult locusts.
He likes also dead mices with tong.
But, he doesn't like anymore hunting Dubia roaches or crickets...He only accepts them by force feeding with tong...