Frogs don't lay their spawn on waterlogged blocks.
- Build the setup as shown in the attachment below. setup.png
- Summon multiple frogs around the setup and breed them.
- Observe the behavior of the frogs closely.
- Take note as to whether or not frogs lay their spawn on waterlogged blocks.
Despite frogspawn being able to exist above waterlogged blocks, frogs will never place their spawn here. They only consider water blocks themselves to be valid placing locations.
Frogs would be able to lay their spawn on waterlogged blocks.