You can freeze cucumbers for use later but when you freeze the cucumbers you should slice the cucumbers up and then place them in a freezer safe container.
Then pour some water over the sliced cucumbers in the container and seal the container and freeze it with the water so that ice is formed over the cucumbers to protect them.
My mom used to do this all the time with cucumbers and they were a nice refreshing snack during the hot summer but you can eat them anytime.