Larger escorts could also fight torpedo boats

To what extent were sloops, corvettes, and frigates used against torpedo boats?

Any suitable convoy escort could engage torpedo boats when required, and those larger escort types carried as much useful armament as their duties allowed.

Anti-torpedo-boat work was a mission rather than an exclusive ship category. Sloops, corvettes, and frigates already present with a convoy could engage fast surface attackers if required. Their weapons and availability made them part of the defensive system even though they also carried major anti-submarine and escort responsibilities. The answer distinguishes a dedicated motor gun boat from the wider force that could protect merchant shipping.