What's the name of this two-lobed shape?

I got an avocado featuring a canal in the middle. The canal is not really deep but still it splits the fruit in two distinct parts. What's the name of this shape? I think "ribbed" is an exaggerated term since it features only one canal.

And what's the name of that canal? Groove?

I have personal experience of such an object – a kidney stone.

I had mine removed by lithotripsy in 1984.

Its technical description is bilobed.

Bilobed : divided into two lobes

Merriam-Webster

On the other hand, it looks suspiciously like NASA's photograph of Phobos, the innermost of the two satellites of Mars.

Avocados are OVOID in shape.

OVOIDAL has the same meaning, another word for egg-shaped. The crack that is visible on the fruit skin is called a ridge, a more precise term would be a longitudinal ridge

Figure 4. A. ‘Hass’ avocado fruit with a longitudinal ridge which C. Schroeder theorized was a result of incomplete closure of the carpel. Such fruit are often scarred on the ridge.

Source: Avocado Fruit Abnormalities and Defects Revisited

The "canal" or "groove" mentioned in the question, and visible in the image posted by the OP is known as a (shallow) longitudinal crack or crease,; deeper cracks that penetrate the exterior skin and expose the flesh may actually cause the fruit to split and spoil.

Source: Citrus Fruit-Cracking: Causes and Occurrence