Hello Madsakre,
1) Yes he looks healthy.
2) You won't hear him call until he reaches 5.5 months of age or or around 2.5" to 3" SVL.
3) offer him what he wants or just feed him as much as he will eat in 15 minutes.
4) I would add Earthworms and Dubia Roaches into his diet.
5) He is large enough for his first pinky when he is 2.5" SVL.