Because you are not the the final level, in order to save the princess you must defeat Bowser in his castle.
You show her a secret message from the Princess. You find it in the Maid's room (castle first floor left).
Females are usually larger. Males have a loose flap of skin under their throats.
Thumbs of males are enlarged for grasping females during reproductive efforts.
When a male toad is on top of a female toad. You can tell the difference because male toads have darker markings that a female toad. Toad's main breeding spot is at the edge of a pond or creek. The male toad sends out loud croaks and the lounder the croak, the quicker it is to get a girl!
Your toad will be skinny, and it might not eat. Also, they might have cloudy eyes
If I were you, I would try blackmail. Here's an example: Man: Hey! If you don't surrender, I'll tell the neighboring country about the thing you did with their princess" Castle Soldier: But I didn't-- Man: Oh I'm sure they will believe you...
If you have the Secret Message from the Princess (from the maid's room in the castle), the mill girl will give you the password to the secret room below the fountain. (see related question)
The toad
no
The male Houston Toad has a black chin, while the feamle does not.
when it is dry under the belly but soggy on top! hope it helps!
you just don't know. (maby a vet?)