New Bullfrog owner -setup questions

[shawnalynn3]

Hello!
I purchased 3 bullfrog tadpoles a month or so ago. I currently have them in a 20 gallon tank of just water. They all have stronger back legs now and like to hang out in the plants by the top of the water. So ive been doing a ton of reading on transitioning thier tank to have partial land. Im still confused though lol. Im assuming th4 best way it to create a false floor (im still a little confused kn how to do it for bullfrogs) but could i just add some bricks and rocks to create a platform for them. I dont know whats best at this stage. Thanks for any help! Im very new to all of this.