Using frozen mince beef
You can of course try to thaw it in your microwave (if you have one) or in your regular oven on low heat. However, I've never had any problems cooking with frozen ground beef. Just cook it on fairly low-medium heat and scrape off the outer layers as they get thawed. This might be easier and take a shorter amount of time if you manage to split it into smaller chunks before cooking it. Continue scraping, and splitting the big chunk into smaller parts as they thaw. If you use a low enough heat,  the parts you scraped off first won't get burnt either. 
Turn the heat up when everything is separated, and fry it. Good luck!