Both spotted and stripped marsh frogs have similar requirements. Yes, humidity needs are not specified, so guess less important than water needs. Those frogs do require a large water area (not dish) around 1/2 the enclosure to swim. You can set this water area by making a low barrier using a piece of glass and aquarium silicone glue.
If you need help doing that, go to African Bullfrog section and look for threads that describe partial water enclosures and include pics. It's not too complicated and should work, as long as your enclosure is designed to hold water, at least a few inches of it.
Remember to change this dechlorinated water often, and even daily if you do not provide a filter. These frogs do not like currents so a strong filter should be avoided or outlet can be pointed away from swim area. A couple non-sharp rocks or turtle shelf can provide a resting place in the water and a ramp up to the land area of the tank. Good luck!