To drop user-defined functions (UDF) in Snowflake, we need the function name and list of parameters. Depending on how many UDFs you have, this can become boring quickly.

Instead of going one by one, run the SQL command below:

SHOW USER FUNCTIONS IN ACCOUNT;
SELECT
  CONCAT(
    'DROP FUNCTION ',
    "catalog_name",
    '.',
    "schema_name",
    '.',
    REGEXP_REPLACE("arguments", ' RETURN .*$', ''),
    ';'
  ) AS drop_command
FROM TABLE(RESULT_SCAN(LAST_QUERY_ID()))

This will return a table like:

Now you just need to review these results and run them. If you want to delete UDFs from a single database or schema, add a WHERE filter on "catalog_name" (for the database) and/or "schema_name" for the schema.