hello. i have a ball python who is a few months old. he is around 170 grams.

i am worried because i am pretty sure i have been underfeeding him.

i feed him a small mouse once every four to five days.
the mouse is too small - it doesn't leave a noticeable lump.
however this is the largest mouse that the seller has right now.

he will only eat live.
i have tried to switch him to f/t multiple times but he completely refuses to acknowledge it.
i have tried warming it up in water, using a hair dryer, using a heat lamp, etc. and he just doesn't want it.

lately he has been acting restless.
the temperatures are perfect in his enclosure (around 80 cool side, around 90 hot side).
the humidity is decent as well.
he will slither around his entire enclosure and try to poke his way out.
usually this means he is hungry. but now he has been doing this very often, and i don't think it's from stress.

i don't know what to do. should i feed him two mice? how do you do that?
should i feed him more often since the mice are so small?

in order to have the right size of food for him, he needs to be switched to frozen/thawed.
i need help doing this.

please help me, i'm getting worried.
thanks so much.