Yes, you can get free TF2 Items on MerchantTF. We have a giveaway every week with a free item up for grabs. You can check out the giveaway page for more details.
You can enter the giveaway by completing the tasks on the giveaway page. Once you have completed the tasks, you will be able to enter the giveaway.
You will know if you have won the giveaway by checking the giveaway page. If you have won the giveaway, you will be able to claim your item.