Okay, from what I know (I think), here are the grabs from behind in each game:
- Batman Arkham Knight: Standard unarmed thugs can grab you in a bearhug from behind
- Catwoman - Unarmed enemies can hold Catwoman's arms behind her back (not all of them do, though)
- Eragon - ?
- Sleeping Dogs - Grappler enemies have a couple grabs from behind: the first is a full nelson (only if there's at least one other enemy around), and if they do the charging grab from behind, they grab you around the waist, slam you to the ground, and try to stomp on your back. Also, you can take human shields
- Resident Evil 5 - Normal, non-mutated, unarmed enemies can hold you in a full nelson. Also, Josh's takedown on a stunned, kneeling enemy from behind is a German suplex
- The Matrix Path of Neo - ?
- The Shield - ?
- Streets of Rage (1, 2, 3, SORRv5) (Sega): Certain enemies (Galsia in 1, the bikers in 2, Zack in 3, and all three types in SoRR) can grab you from behind (full nelson for Galsia and Zack, waist bearhug for bikers)
- Shadow of Rome (PS2): You can do a German suplex on stunned enemies while playing as Agrippa
- Beatdown Fists of Vengeance: There are various grabs from behind, including a full nelson if you shove your opponent into certain types of ally
- Def Jam Fight for NY (PS2): If you or your opponent is knocked backward into the crowd, a man in the crowd may grab you or your opponent in a full nelson
- MK11: The enhanced version of Johnny Cage's stunt double has his stunt double grabbing his opponent in a full nelson
- TMNT Shredder's Revenge: The Foot Soldiers can grab you in a full nelson
- FFVII Remake: Don Corneo's thugs can grab you in a full nelson
I also have some more:
- Assassin's Creed 2, Brotherhood, Revelations, 3, Liberation, 4, Rogue, Chronicles China, and Valhalla: Certain enemies can grab you from behind
- Uncharted Lost Legacy: Non-Elite enemies can grab Chloe in a bearhug from behind
- River City Ransom Underground: You can hold enemies from behind in a full nelson (not sure if enemies can do the same)
- Gears 5: The Sire enemies can grab you from behind and try to drag you away, decapitating you if you're not rescued
Edit: Got a few more:
- Mortal Kombat X: One of Kano's combos ends with an exaggerated German suplex
-Injustice 2: There are two I know of; one is Batman's standard grapple, which has him grab his opponent from behind before shooting his grappling hook upward, dropping them down. The other is the enhanced version of Swamp Thing's Bio-Fission special move, where he summons a double to grab his opponent in a full nelson before attacking them
-Metal Gear Rising: Some enemies can grab the character in a full nelson. Gyaku by default, but there is a mod to swap to a female character