They frogs you listed would make horrible house mates. They are all from various places and ecosystems from around the world. Being from different places and being wild caught they will be carrying exotic pathogens that the other frogs in the enclosure will have no immunity to. At least two of them are known to be toxic.

The general rule is that you don't mix species, especially for beginners. Its just not a good idea.

Undertank heaters really don't work well for amphibians as their enviroments are generally really wet to moist and that can cause a thermal crack if a heater is placed under the tank. Mounting the heater on the side is better.