Partial Multiattack. The Yeetle can Grab and Yeet or Slam on the same turn if it is not impaired by any of the following conditions: blinded, grappled, incapacitated, paralyzed, petrified, prone, restrained, stunned, unconcious, exhaustion(2).

Grab. The Yeetle tries to grapple a creature in front of it. The Yeetle makes a strength(athletics) check, contested by a targets dexterity(acrobatics) or strength(athletics) check. See grappling rules for further information.
It cannot grapple targets bigger than large.
If the Yeetle succeeds it deals 2d6 bludgeoning damage and can use its Yeet or Slam action.

Yeet. The Yeetle tries to launch the grappled creature over its shoulders. The target must succeed on a DC 17 dexterity saving throw or be launched 10-30 ft. behind the Yeetle. The range depends on the size of the thrown creature.
tiny: 30ft. / small: 25ft. / medium: 20ft. / large 10ft.
On impact the creature takes 1d6+1 fall damage per 5ft. travelled and is knocked prone.
If the grappled creature succeeds on the saving throw it escapes the grapple and stands in front of the Yeetle. If that space it occupied the creature lands on a free space somewhere in front of the yeetle.

Slam. The Yeetle slams a grappled creature into the ground, dealing 2d6 + 4 bludgeoning damage.

Charge.  The Yeetle uses it wings to jump 25ft. towards a target. If it lands in meele range (5ft.) the target must succeed on a DC 14 strength saving throw or be knocked prone.

Swirling dust. When a creature attacks the Yeetle from behind, it can use its reaction to swirl up dust. The Yeetle rolls 1d8, applying a bonus to its AC equal to the number rolled, potentially causing the attack to miss.