before we can sell the stuff, we must find an appropriate place/person where to sell it.
presumably in the town there are stores, and some may be interested in them.
then we have to try to get a decent price out of it, and haggle or barter.
the basic Player HandBook has a list of gear, with prices:
the general rule are (Page4 3):
Opportunities abound to find treasure, equipment, weapons, armor, and more in the dungeons you explore. Normally, you can sell your treasures and trinkets when you return to a town or other settlement, provided that you can find buyers and merchants interested in your loot.
Arms, Armor, and Other Equipment. As a general rule, undamaged weapons, armor, and other equipment fetch half their cost when sold in a market. Weapons and armor used by monsters are rarely in good enough condition to sell.
Gems, Jewelry, and Art Objects. These items retain their full value in the marketplace, and you can either trade them in for coin or use them as currency for other transactions. For exceptionally valuable treasures, the DM might require you to find a buyer in a large town or larger community first.
Trade Goods. On the borderlands, many people conduct transactions through barter. Like gems and art objects, trade goods—bars of iron, bags of salt, livestock, and so on—retain their full value in the market and can be used as currency.
on pages 44-54 there are tables with the value of goods, weapons, services and so on.
for reference, a shield costs 10gp, a scimitar 25gp, a shortbow 25gp, a morningstar 15 gp, wolf pelts are not listed so it is up to the trader
we already took out of that list what we want to keep, i think, so we should try to sell everything we can, including the frog statuette (unless it is only worth but a few silvers, in which case I am fine with syllin keeping it)
the goblin's weapons are going to be worth significantly less than their store equivalent, because they are goblin-made and used. Our saving grace is that Syllin made them look as good as they can, so hopefully we can get a little something out of it.