Can any leather crafters tell me what tool this is?
Awls are typically used for punching holes into objects, awls come in different styles. This one in particular, if you look at the back end, looks very durable, and able to be hammered on the back without issues. So it is able to push through thick leather easily.
Standard image of an awl:

Awl being used to punch hole:

Awl being used in practice to lace leather:

Sources:
https://hausoftools.com/blogs/news/tools-of-the-trade-tools-for-leather-working
https://www.instructables.com/how-to-prepare-leather-for-sewing/