Thailand garden, any idea what this is?

Hey folks. I'm American, retired to Southern Thailand three years ago.

Was never a gardener in the US, but have decided to try here. Yeah, quite the learning curve.

Found two of these while picking some tomatoes. They fell apart when I picked them, exposing the dark green seeds. Definitely not from our tomato plants.

Sorry no banana for scale, but they were each about 3cm round. Smelled "earthy" and were kinda slimey.

Any idea what these are?