Yes it can grow back but it will grow improperly. An improper growth of the thumbnail would cause serious pain. I recommend you to get it removed at this stage. Also must consult your local doctor for the cause of the blackening of your thumb and it's proper treatment.
Eyelashes fall out all the time but they will grow back.
No if horns fall out they never grow back, antlers fall out and grow yearly.
Yes when molars fall out they grow back !!!
They grow them back.
No they do not shed there horns but if hit or damaged they will fall off and grow back
They will grow back maybe
Curling them should not cause them to fall out, so they shouldn't need to grow back. However, if you have managed to pull them out, yes, they will grow back.
It will probably take a while to heal, but eventually it'll grow back and he'll have a cute black nose again. :)
yes, and it will never grow back.
Yes, of course! When they lose their scales, they always grow back!