yeah you can make cannabutter. Someone I know just did this with a medium sized male plant. Chop it up, dry or not, and throw it in a medium size pan with two sticks of butter, salted or unsalted (have heard unsalted works better but salted worked for me). Add a quart of water to the mix, partially cover the pot with its lid, and set it on medium low until it gets to a gentle boil. Then back off the heat closer to low, maintaining the boil, and let it go for as long as you can, checking periodically to ensure it doesn't burn. After 4 hours of more, the butter should have absorbed all available THC.
Strain the mix and cool it in your fridge. After a night of cooling, the remaining water will have separated from the butter and you can scoop the green brown butter goop off the top. There you have your cannabutter! Happy baking!
P.S. the brownies we made with this butter were the most narcotic thc experience I'd ever had. So heavy and stony, and they lasted for many hours. But really nice. Just don't do it if you have an aversion to sleeping!