Sea of thieves, currently, has only two throwables: The Blunderbomb and Firebomb. So, here's five more concepts for new ones!
Note: These items are purely throwables, and as such, can't be shot from cannons.
Dagger: Deal 20% Damage when thrown, and can be picked back up afterwards if it didn't hit anything. Can be found in barrels, stuck into walls/tables, and in crates.
Hex Potion: Deals 5% base damage with a small AoE, and applies a random effect from any of the green cursed cannonballs [Dancing, sleeping, drunk, etc.] Can be found in barrels or bought from Order of Souls.
Smoke bomb: Creates a small cloud of smoke with a blinding effect similar to the Ashen Winds Boss smoke screen. Can be found in barrels or bought from Gold hoarders.
Spear: Deals 75% damage on a direct hit, but player has to stand completely still to throw it. Can be picked up after being thrown if it didn't hit anything. Can be found on islands, or bought from Hunter's call.
Stinkpot: Deals 0 damage directly, but has a medium-sized AoE [marked by a dark green mist] that makes players within it Drunk and poisoned for 5 seconds. Can be found in barrels or bought from Merchant's alliance.