Yes, bullfrogs do eahc have their own "froginalities." My big male is very skittish, hides when his tank is approached, yet if i am Very patient, I can get him to handfeed. Crickets only, though; he avoided taking both worms and fish out of my hand, but catches these on his own. I have seen completely ild female bullfrogs that will just sit floating in the water and let you pick them right up from the side of a boat, and then some captive ones which were terrified of people. Kinda weird.