Think force feeding is a last case scenario due to stress it causes to frog. If frog has not pooped there is possibility it's impacted. How large where the Dubia's compared to the distance between frog's eyes? If larger and specially if males with wings; frog might be impacted.

Recommend give it a bath in a small critter keeper or plastic bowl with a holed up top. Use dechlorinated 80F tap water with a couple drops of honey for 20 minutes in chin deep solution. Once frog is in bath, cover with small towel and let it relax. After 20 minutes remove solution and replace with 80F dechlorinated tap for another 20 minute rinse.

If frog poops; remove it and place it in it's enclosure water bath. If it does not; repeat daily until it does. Also; offer night crawlers once it poops and raise the enclosure temp between 82 to 84F during the day. Good luck !