Just dumping some tags. A good chunk of these may already be here in the thread, but I cbf checking. Compiled from a couple of lists out there, so a few may be described inaccurately?

魔物化 Monster transformation
食品化 Food transformation
風船化 Balloon transformation
風船ガム Bubble gum
非生物TF Non-biological TF
陶器 Ceramics
陰茎化 CTF (Cock Transformation)
金化 Gold transformation/petrification
融合 Fusion
蝋固め Wax encasement
蝋化 Wax transformation
蝋人形化 Wax doll transformation
苗床 "Nursery"
膨張 Expansion
膨体 Bloating, inflation
膨 Swelling / Turgor
胎内回帰 Unbirth
肉繭 Flesh cocoon
肉壁 Meat walls
粘液固め Mucus (slime, goo, cum, etc.) encasement
粉々 Shattering/breaking apart
箱化 Cubing/Box transfomation
石化破壊 Destructive petrification
石化 Petrification
球体化 Sphere transformation
状態変化 "state change", usually used for all kinds of inanimate TF.
物品化 Object transformation
溶解 Liquid transformation / Melting
液体化 Melting
消化 Digestion
泡の中 Inside bubble
植物化 Plant transformation
彫像 Statue
形状変化 Shape change
弾性 Elastic
平面化 Flattening
大破 Wrecking/Smashing/Destroyed clothes
変化 transformation in the most general sense
埋め込み Embedded
圧縮 Compression / Shrinking
固め Compaction / Encasement
吸収 Absorption
同化 Assimilation
取り込み Ingestion/Intake
包まれ Wrapped up
凍結 / 氷漬け Freezing
人形化 Doll transformation
丸呑み Vore
フィギュア化 Figurine transformation
ネウロイ化 Tech state change
チョコ化 Chocolate transformation
チョコまみれ Covered in chocolate
チョコ Chocolate
スライム化 Slime transformation
ジンメン "Simmen" (Face visible absorption)
シュリンカー Shrinking
シャボン玉 Bubbles/Bubble ball
カード封印 Card sealing
オナホ化 fleshlight/Sex toy transformation
ウツボカズラ Pitcher Plant
ぬいぐるみ化 Plush doll/stuffed toy transformation
お菓子化 Candy transformation
うごイラ Animation