You can try Archive of Our Own (AO3). It has a vast collection of fanfictions, and there are likely many 'deku x froppy' ones there. Just use the search function and type in the relevant tags.
One great 'deku x froppy' fanfiction could be 'Green and Froggy Bond'. It beautifully portrays their relationship growing from classmates to something more special. It shows Deku's admiration for Froppy's unique abilities and Froppy's growing fondness for Deku's kind heart.
Often, there are plotlines where Froppy and Deku are in a sort of mentorship relationship in reverse. Froppy, with her calm and collected nature, helps Deku deal with the stress of being the symbol of hope. They might have heart - to - heart conversations about their insecurities and how to face the challenges of being heroes. And there are also stories where they discover a new combined move using Deku's strength and Froppy's agility and sticking abilities.
Writers often give Froppy more depth by exploring her backstory further. For example, they might show how she grew up with her quirk and the challenges she faced in a more detailed way. With Deku, they might focus on his mental state during different battles and how he interacts with Froppy. They could write about how Deku's admiration for Froppy's unique abilities affects his own growth as a hero.
She would probably become more protective. Not only of herself but also of her unborn child. This could manifest in her being more vigilant about her surroundings, more careful about who she trusts, and more assertive in ensuring her safety and the safety of her future baby in the often - dangerous world of MHA.
There could be various interesting 'froppy lemon fanfiction' stories. One might involve Froppy's unique character traits being explored in a new adventure. For example, a story where Froppy uses her frog - like abilities to solve a mystery in a magical forest. Another could be a story about her friendship with other characters evolving in unexpected ways.
You can start by looking on fanfiction websites such as Archive of Our Own. They have a large collection of fan - created works and might have some 'froppy lemon fanfiction' available. Another option could be FanFiction.net, which also has a wide range of fanfiction from different fandoms.
One plot idea could be focusing on Froppy's journey through pregnancy. Maybe she discovers she's pregnant unexpectedly and has to deal with the initial shock while still being a hero in training. She might struggle to balance her training and the physical and emotional changes of pregnancy.
The main differences are in their expressions and some minor details of personality. In the manga, Deku might seem a bit more intense, while in the anime, he's sometimes presented a bit softer.
Deku might be completely shocked at first. Since Bakugou has always been so aggressive towards him, he would never expect such a confession. He might just stand there, mouth agape, not knowing what to say.