Need help telling the male vs female

[Kwillis22]

Hello,
i am new to caring for fire belly toads. They were dropped off in my classroom from a former student that could not care for them. They are set up in a little tank that i purchased for them and they have ample amounts of crickets. The first day I brought them home they started croaking. I don't know if they are both croaking or it's only one. I need help telling them apart. I've taken pictures of them but I don't know if it's two pictures of the same one. I am so bad at this.
i don't know if any of themes images help.. but this is all i had so far..

[Kwillis22]

Here are my three FBT's. Please tell me that ONE is a female.. i am giving up if they are all three males. I need all the help I can get. PLEASEEEE

[Bombina Bob]

to me they look like all males, males will have ful webbing on their back legs and will call, females are larger and have less webbing. i understand your confusion, when i first got my FBTs i went back and forth from male to female and vice versa. if you do get a female, make sure to look at the details on the body, Skinny arms, chunky body and less foot webbing.