I've never heard of that, a Bullfrog, I'd surely need some explanation.
Well, I'm sorry there's no explanation because I'm just seeing it for the first time and had to research on it.
What I'm certain about is that I've heard about is a frog but wowwithout words, the bullfrog is bigger even it's eyes.
In the wee of the night, you should hear it's croak. It's so annoying than the usual sound that frogs make.
Source
I wasn't sure what the noise was when I went to take a walk at the swamp. I could just understand there was a loud croak coming from under water like a drown but there it was hiding from me.
I simply had to go list around the corner then the bullfrog emerged from the water and I thought, wow, that's big.
No idea whoever named the frog a bullfrog but clearly, it wasn't the usual frog that is seen.
I think right now you'd be able to tell people you seen a bullfrog not just heard about a story.