Yes, but only from licensed operators. Apple's App Review Guidelines, section 5.3, require real-money gambling apps to hold a licence in each market they serve.
Apple adds two further conditions. The app must be free to download. It must also restrict access to the regions where the operator holds that licence. That is why a Canadian App Store account sees a different sportsbook list than a US one.
For bettors, the App Store works as a first filter. A sportsbook found only as a web link or a "configuration profile" download deserves suspicion. Legit iOS apps do not need workarounds.