Who's the Jaw Titan?

The identity of Attack On Titan's current Jaw Titan is Falco Grice, a Warrior cadet who was imprisoned in Eldia and transformed into a Pure Titan which then ate Porco and gained his powers.

Is YMIR the Jaw Titan?

Ymir was able to transform herself into the Jaw Titan (顎の巨人 Agito no Kyojin^?), a 5-meter Titan. She gained this ability after she ate Marcel Galliard, a Warrior from Marley, in the year 845. ... This appears to be a defining ability of the Jaw Titan, as Porco Galliard does the same during the Raid on Liberio.

Does Eren eat the Jaw Titan?

Recovering from the injury, and seeing the Attack Titan heading towards Zeke, the Jaw Titan quickly moves in to bite off the Attack Titan's leg. In response, Eren hardens his hands and strikes the Jaw Titan's neck, damaging Galliard inside and knocking out the Jaw Titan once again.