Can you tell ne y i have dark toe nails im a male?

Usually it is : Fungus, other possibilities could be blood from trauma or sports activity. Sometimes there is keratin build up.

Dark Toe Nails: Dark, brittle or thick toenails can be caused by a number of irregularities in the nail bed, including trauma, fungal infections and ingrowth. Some will heal with time, but others may need doctoral intervention.

Runners Toe/Fungus: The two prime suspects here are runner's toe (aka black toe) and toenail fungus. Runners toe is a hematoma (blood blister) develops from repetitive micro-trauma (toe box of shoe is either too big or too small). Toenail fungus also frequently causes discoloration. See you podiatrist, they should have no trouble getting to the bottom of this.