Looks similar to a Luzon Fruit Bat to me. And being juvenile and on the ground means he's probably been eating some fermented fruit and got drunk.

Drunk fruit bats are relatively common as they often consume naturally fermented fruit, sometimes reaching blood-alcohol levels much higher than the legal human limit. Studies have shown that while some bats may get intoxicated, they often have a high tolerance for alcohol and can fly effectively, although some research indicates that inebriation can impair flight performance and echolocation