Whether you have a Toyota floor mat or any other, the clips on all the floor mats are the same. To remove them, try to insert a wide flat-bladed screwdriver under the front of the clip, twist it, and pull it out from the rear cut out in the carpet. You can also use a cutter with a safety plate to uninstall the clips. If it doesn't help, you will have to resort to a more brute force, like the usage of a rotary tool. However, you must be very careful with it if you don’t want to damage the clips.