Hey , I have a problem with my pacman frog

[Lija]

you can get that one Exo Terra : Faunarium / All-Purpose Terrarium you have the largest one, is it right? for a baby the best would be PT2260 and s/he is bigger get a bigger one.
you can get 12"x12"x18" ( mini tall) for now too, put about 3cm of plantation soil, no moss! put some plant or log or something to minimize space and create a hide. and if you have a girl and she is big then you can upgrade her when she is older and if that is a male he will be perfectly happy in small tank.

moss - of course baby hides under it as there are no other options for him, it posses a very high impaction risk, that i don't think you want him to experience.

you need to feed him every day using 15 min rule - give as many as he can eat in 15 min every day while he is a little. but he may not eat for you until conditions are right and he is settled down and feels safe.