Congrats on your little froggers.
I think you already know how much I love ADF's!
I give mine about 5-6 blood worms a peice once a day. Mine are adults so if yours are small, a couple a day should be fine.
After they're done eating, they should have little round bellies. Not big!
While I'm sure they enjoy the shrimp pellets, I wouldn't give them as a main diet.
HBH frog and tadpole pellets are more balance for them.
They do hide a lot especially at first, but soon they get used to the tank and come out more especially when they get used to what time feeding time is.
My two are in a 5g mini bow and I swear, sometimes I have a hard time finding them. lol
Make sure there are NO openings, they can squeeze out of the tiniest openings.
Believe me, I found out.

Thank goodness I saw him in time.
I think I gave you this link before, but just in case:
Care Sheet For African Dwarf Frogs
Keep an eye out and have a back up plan in case your
betta doesn't accept them.
Enjoy them and post some pics soon!