Basic potions (not decoctions) and bomb names follow the same pattern. The different levels of the items are named using numbers, so for example Thunderbolt is Thunderbolt 1,
Enhanced Thunderbolt is Thunderbolt 2 etc. 

For the most part the in game names match up to the code names for the items, but there are some exceptions which are listed below.

[In game names]							[Code names]
Devil's Puffball						Devils Puffball
Dimeritium bomb							Dwimeritium Bomb
Dragon's Dream							Dragons Dream
Moon Dust								Silver Dust Bomb
Northern Wind							White Frost

Petri's Philtre							Petri Philtre
White Raffard's Decoction				White Raffards Decoction

Alghoul Decoction						Mutagen 15
Ancient Leshen Decoction				Mutagen 22
Arachas Decoction						Mutagen 2
Archgriffin Decoction					Mutagen 4
Basilisk Decoction						Mutagen 23
Chort Decoction							Mutagen 8
Cockatrice Decoction					Mutagen 3
Doppler Decoction						Mutagen 11
Earth Elemental Decoction				Mutagen 20
Ekhidna Decoction						Mutagen 21
Ekimmara Decoction						Mutagen 7
Fiend Decoction							Mutagen 16
Foglet Decoction						Mutagen 9
Forktail Decoction						Mutagen 17
Grave Hag Decoction						Mutagen 18
Griffin Decoction						Mutagen 27
Katakan Decoction						Mutagen 1
Leshen Decoction						Mutagen 26
Nekker Warrior Decoction				Mutagen 25
Nightwraith Decoction					Mutagen 6
Noonwraith Decoction					Mutagen 13
Reliever's Decoction					Mutagen 28
Succubus Decoction						Mutagen 14
Troll Decoction							Mutagen 12
Water hag Decoction						Mutagen 5
Werewolf Decoction						Mutagen 24
Wraith Decoction						Mutagen 19
Wyvern Decoction						Mutagen 10

Foglet									Fogling
Fire elemental							elemental_ifryt
Ice Elemental							elemental_ice
Endrega (various types)					Endriaga