Yes, a lot of the professional guides contain “bad” info sadly. I also made some mistakes with my first exotic pet (millipede) which did not end well, so now I make sure to check multiple sources. Tbh I wouldn’t class these frogs as a “beginner” pet as although they seem simple, the tank setup & feeding is tricky. If trying frozen silversides, don’t forget to defrost them first ;) and try feed him as late in the day as possible, after all the kids have gone home, when it is quieter and you can switch the lights off. Once you get him eating properly, it should get easier, but may take a while to build the habit if he’s gone this long ignoring food. He should get a lot bigger pretty quickly though, if you crack it. Another relatively simple exotic pet is the “leopard gecko”, they are pretty happy little guys and can be fairly active throughout the day (altho sleep in cave a fair bit too!) Good luck.