Edit: This has now been updated: https://www.furaffinity.net/view/26824346/

Today's headline: "Babbling Bulma Bothers Baba, Becomes Bullfrog!"

Frogs are my favorite TF. When I found a pic of Bulma that was pretty close to her being in a frog-squat position, I thought to myself, "I wonder if I can use that to make a frog tf."
Apparently, I can. I added Baba in because she dresses like a witch and is easily annoyed. I figure Bulma, being being incredibly talkative and obnoxious, would probably get on Baba's bad side pretty quickly. So, Baba decides to shut Bulma up by zapping her with transformative eye lasers. Baba isn't shown to have any such power in the show, but that's what imagination is for - making shit up to indulge personal interests.
Desert's not exactly the best climate for a frog, but fortunately for Bulma, Baba's got a nice, comfy moat for her to live in. I'm sure once she gets used to it, she'll find it quite enjoyable. Or she'll go home with Goku and sit on his pillow every night croaking until he finds the dragonballs to wish her back to normal. One of the two.