Highly unlikely.
How small is small? You will need a larger caliber. Something like .25 cal. Also suggest you get a rifle not an gun. Select a hunting pellet (hollow point) with a much heaver grain. Hogs have thick skulls.
An airgun is not a toy! It can be a harmful weapon even though not like a real gun. It uses something like a carbon dioxide cartridge to propel a missile, usually a pellet or something small. They can cause injuries!
It all depends on the model, Pellet size and power of the airgun. Most are capable of shooting small rodents and game. Like birds. However high end pellet rifles that are in the PCP class ( PreCharged Pneumatic) air rifles are capable of bringing down big game like a moose. These air guns & rifles can be charged to 3000 PSI and can fire a 50 Caliber pellet.
I doubt it.
Several airgun makers make suitable pellets for hunting. Try Crosman "Hollow point pellet" they are designed for small game hunting. Or the Gamo "Pointed Hollow Point" it also is designed for hunting. Stay away from the Gamo "Raptor" Pellet. It is too light and wonders off target in a breeze.You could use any pellet almost.
A small grain or pellet. Medicines that come in granule form usually are mixed with liquids or sprinkled on food before they are taken.
I assume you are using a rifle not a gun. Almost any of the hunting ( Hollow Point ) pellets will do the job. Beeman makes a good 7.2 grain hollow point. I like hollow point because they mushroom when they hit the target. Small hole going in, large hole coming out. Predator also make a very good hunting pellet, it's 8 grain and bone crushing. See the link below.
Small.
I clean my rifles around every 500 pellets or sooner if I think they need it. I do have some suggestions for cleaning. First of all never use regular gun cleaning products. the cleaning agents will damage the seals in the airgun. Only use Crosman pellgun oil or RWS airgun oil to clean and oil the airgun. You can purchase cleaning pellets from "pyramyd air, See Link Below" to clean out the barrel or purchase a airgun cleaning kit. Add a few drops of airgun oil to the working parts of your rifle. Put a small thin sponge in the bottom of your pellet tin with a little pellgun oil to lubricate the pellets, This will coat your barrel on the inside. Don't over oil the air rifle.
Neither. It has no visible grain.
grain and other small particles grain and corn grain and corn
Small pellet mills can be purchased from farm supply stores for home use. Otherwise there are professional pellet mill companies that offer milling services to the public.