I have a juvenile pacman frog that eats 2 nightcrawlers every 2-3 days and he seems to be doing just fine! I generally cut them up into halves but I will feed him whole ones if they're small. I've had him for about a month and a half and he's probably about 2 inches long now. I haven't found any solid information on feeding nightcrawlers as a staple diet so I am just winging it and paying attention to how he is growing. I hear they love hornworms but I haven't gotten around to feeding mine any yet - I believe they should just be offered as a treat though.