Minecraft wiki entry for Development_versions, associated text: MC-249103 – Z-fighting can be seen on the underside of frogs' feet.
MC-249110 – Z-fighting textures inside the frog's mouth.
MC-249115 – Frogs spawn with wrong color in some biomes.
MC-249132 – Frogs are not required to be bred for the Two by Two advancement.
MC-249168 – Dispensing a Bucket of Tadpole above or below a dimension dispenses the item, instead of a tadpole.
MC-249349 – Dispensing a Bucket of Tadpole dispenses the item, instead of water with a tadpole.