BetterMobDrops

Allay – Amethyst, rarely music discs not found in trail ruins or trial chambers.
Armadillo – Armadillo scutes.
Bat – Rabbit hide (now renamed to hide for both rabbits and bats for item stacking)
Camel – Leather.
Creaking – Sticks, resin clump.
Frog – Frog spawn/slimeballs.
Goat – Mutton, wool, leather, and rarely goat horns.
Happy Ghast – Rarely ghast tear. Also when killed with fire aspect or while on fire will drop a dried ghast.
Llama – Wool, Leather.
Pillager – Emeralds during raids.
Player – Player head when killed by charged creeper.
Shulker – Up to two shulker shells.
Sniffer – Feather, moss block.
Vex – Echo shards, rarely music discs 11, 13 or a disc 5 fragment.
Villager – Emeralds and farmed foods.
Vindicator – Increased emerald rates.
Zoglin – Leather, rotten flesh.

Jungle Leaves – Fixed sapling drop rate.

Works on Minecraft versions 1.21.2 and newer

Inlcudes files to have membrane drops from bats and player heads to always have a chance to drop
See README.md

Please let me know if you think other mobs are missing out on item drops