I've never done a fish less cycle in 52 years of fish keeping; so can't help in there

. Have you added AmmoLock or similar products? They cause many cycling problems IMO.
Myself would do a large water change (100% if used ammonia blockers products mentioned); add dechlorinated same temperature tap; add Seachem Stability; and the frogs.
Do not overfeed, do continue using Stability per bottle directions, and tank should be cycled in couple weeks. When doing water changes clean filter media in tank's water being removed; not in tap. Good luck

!