SnowSQL, a command-line tool used to interact with Snowflake, has specific commands that are unique to it. 'GET' is used to download files from a Snowflake stage, and 'PUT' is used to upload files to a Snowflake stage. These commands are specific to SnowSQL and cannot be executed using other interfaces like the Snowflake web interface or other SQL clients. Therefore, the commands that can only be executed using SnowSQL are 'GET' and 'PUT'.