My male hermanns has much longer tail than that, so I'd say female for now but keep watching as sometimes when the tortoise is not fully mature and still growing. Also in my experience, when I soak my tortoise the male will sometimes "flash" his thing so you'll know.
Crunchy Dave's already got more tail, in relation to the rest of his body, than any of my females, so you may not need to worry about changing his name just yet.