Monstrous Menagerie II: Hordes & Heroes has a launch date! Mark your calendars for November 12th, 2024. 300+ more monsters for your D&D 2024, or Level Up: Advanced 5th Edition games, plus new horde rules and rules for heroic monsters who level up alongside you--whether they be allies, companions, or foes! Click here to follow on Kickstarter!
Translating from the pathfinder 1e version to 3.5 would be fairly trivial. Most stats can be used as is with a few adjustments for things like grapple.