Is this normal frog behavior?

[Louis Charles Bruckner]

First of all don't you monitor the enclosures temperature with some kind of thermometer?
Since your frog is still pretty young it needs temps from 80 to 85F during the day and 75 to 80F at night.

Another reason why it might be a little more active now is that with the sides covered it feels more secure.

And your frog is big enough to eat a entire night crawler. But leaving them on the substrate or in a dish is not a good idea.
Use plastic or rubber tipped tongs to feed the frog. just rub the worm gently across the frogs lips.
be patient it will take a little time.
When it gets hungry enough it will eat it.