Hello,
Unfortunately, no, the front and back of a flashcard generally cannot be different sizes. They are designed to be a single, cohesive unit, so they will both be formatted to the same dimensions. To make your flashcards look better, you can try adjusting the font size or using a template that allows for more flexible text arrangement. For a short question, you could also consider adding a related image to take Official Site up some of the space on the front.