Yes, there are lots of ways to sharpen an axe, depending on what you have around. Metal files are great for repairs and sharpening, and you can also get large whetstones that are specifically sized for axes and other large bladed tools. Finally, there are even camping hacks such as sharpening with a river stone that you can find on YouTube but while that kind of thing will work in a pinch, your blade will last a lot longer with a puck sharpener, whetstone, or a file.