Source: Statmuse query
Coincidentally, his opposing QB today, Joshua Dobbs, is #4 on the list with 0.90 fumbles per game (18 fumbles in 20 games including today.)
Ryan Leaf is between those two QBs with 0.96 fumbles per game with 24 in 25 games.
bad snaps by the center should be charged as a fumble by the center: https://www.reddit.com/r/nfl/comments/jgrar5/stat_question_if_a_center_snaps_the_ball_over_the/g9s1p35/