Hello! I'm sorry to hear Whitley is having some trouble. The fact that he tried to eat a worm is very good and it hopefully means he isn't ill, just clumsy. Is he a pretty young frog? Sometimes they have difficulty catching things and seemingly give up after a few unsuccessful tries. Before you take him to the vet, try some of these things:

1. Feeding with bamboo tongs. I know you said you tried hand feeding already, so this might not be the best alternative option, but you can always give it a try. Some frogs happily eat off of tongs, others do not.
2. Getting a shallow glass bowl to put dubia/wax worms in inside of the tank. It will help contain them and he should be able to find it by the movement.
3. Remove him from the tank and try feeding him in a different container altogether. Sometimes getting rid of obstacles within the tank is all they need.

If none of these work out, then maybe a vet visit would be a good idea. Do you have a picture of Whitley? If there are any physical signs of illness, some of us on the forum may be able to spot them for you. Also check under his belly to make sure his legs are good, pale color; septicemia may only show as redness on the legs and the frog otherwise looks okay, so it's good to check.

If you like, you can also fill out the form here if you want to give us more thorough information.