leos will sometimes take turkey flavored baby food--i would recommend this over fruit because it has high protein content which leos need. i have used turkey baby food with mashed mealworms and waxworms in it to handfeed before--after a few days the leo started licking it from a dish of the mix left in its enclosure. once strong enough to start hunting for food i started feed live insects.

i'd recommend a trip to the vet as suggested to check for parasites and possibly impaction if the leo was kept on loose substrate.

leos need a warm side of about 88-90 degrees and a cool side of about 78 degrees. you should have a cool side and a warm side hide--the warm hide should also be a humid hide to help with shedding. a dish of water and a dish of calcium should be kept in the enclosure at all times. you can also keep a dish of mealworms in the enclosure for him to eat from as he wants once he starts eating insects again, supplementing with crickets, phoenix worms, feeder roaches, etc. every few days.