>>8275941: You use a stick or mallet for the hammer and a thick rock for the anvil to make a rudimentary hammer. You don't need tongs for that, just something thick enough to carry it from forge to rock and back. You beat it to hell and back with the stick/mallet until there is enough of a shape to have 1 flat side and area to tie it to a handle. (don't use a rock as a hammer, it is too dangerous)
2: You'll need a cheater stick to act as a "tong". Just bend a stick around like a pair of tweezers, flatten the tips, this will work and is easy enough to make. It won't last long but you can make many of them. Use this to make your spike and each side of the metal tongs.
3: Use the spike to make holes in the tongs. Use wood to make a temp rivet and use the tongs and hammer to make a metal rivet.
4: Start making a square anvil.
Now you are ready to build anything.
Additional tip. You can make metal tongs that look like the BBQ tongs, but they are just 2 spikes with flat ends lashed to a green bent stick as the spring in the back. You can replace the spring stick as much as is needed. With this, only the metal parts will touch the hot work peice.