If Frisky and Wink are trying to get into amplexus with Spike, they're probably males, whilst Spike is a female. A croak will confirm it.
I'm no expert on FBT's, but I think that's a good amount of water. More could actually be nice for them.
My juvenile bullfrog has a very small land space, and only 2 small areas to be dry, but she rarely even goes on those. So I think you've got plenty of land area.
Oh, and that's a great setup
