The first thing to established is the current size of the animal (weight), regardless of the weight the animal was not properly fed before neither is he now.
Than a complete description on it's enclosure (size,size of the hides), how the temps are regulated, with what type of thermometer they are measured, etc.
A 2 years old animal would not have made it to 2 years on grasshoppers so the animal is either not two or was not fed grasshoppers.
Accurate answers are important they will determine are to best setup this animal based on size same goes for the food that need to be offered.
Rescuing an animal is great but you must have the knowledge to do so otherwise it makes little difference.