When it comes to knowing when frog legs are done, there are a few key things to keep in mind. First and foremost, you'll want to make sure that the meat is cooked all the way through. This means that it should be white or pale pink in color, and not red or pink at all. Additionally, the flesh should be firm to the touch - if it's mushy or falls apart easily, it's not done yet.
Another thing to keep in mind is that frog legs can overcook relatively easily. This means that you'll want to err on the side of caution and take them off the heat before they're fully cooked through. Otherwise, they may become tough and dry. As such, it's always better to slightly undercook your frog legs than to overdo it.
Finally, remember that different methods of cooking will result in different cook times. For example, frying will generally take less time than baking or boiling. Keep this in mind when deciding how long to cook your frog legs for.
In general, then, you'll want to cook your frog legs until they're just done - no more, no less. By following these guidelines, you can ensure that your frog legs turn out perfectly every time!