[It's possible they may have, but at this point I don't remember oops...but even if they haven't, Izuku does recognize Leo when he comes up on the scene just as Izuku is climbing aboard, smoothing a hand gently through Toshi's feathers.]

Oh- this is Toshi! He's my friend from Fellden. He let me ride him during the last big battle we were part of, and afterwards the Emperor let him stay with me.

[The bird in question turns to look down at Leo, but fortunately doesn't seem interested in devouring him. He just clacks his beak softly, eyes intelligent despite not saying a word.]