Is there a "SD Memory Card Formatter" equivalent for Linux?

SD cards do not need to be formatted. "Formatting" is an old term specific for magnetic disks, where you prepare the tracks and sectors for actual data (they are not defined by disk, but by the head when you format the disk. So formatting is very slow.

Now "formatting" is not more such slow process, so it is not really formatting.

Often programs will just do a mkfs style formatting, so just creating the structure of file systems. Where to put data is already defined by card and internal controller.

Unfortunately I'm not find the command (given by controller) just to tell disk that sectors are not used. This may help, but possibly it is part of mkfs (hidden on kernel side). But do not do unnecessarily dd but on real magnetic harddisk: on SD, SSD, etc. they just consume the device.

If you use dd correctly it's extremely fast:

There is no reason to overwrite the whole card, that will always take a long time, no matter what software you use. You just have to remove the first sectors (partition table):

dd if=/dev/zero of=/dev/locationofcard bs=1024 count=1000

A way lower count will also do the job, but this should already be fast enough (seconds).

I am using 1000 as 'safe' value because i don't know by heart how low you can get.