The Bug:

When frogs jump, they have a special jumping animation, that spreads their legs as they fly through the air and returns them to their default state as they land on the ground. Sometimes, when frogs jump, this animation can end early, or even instantly, causing frogs to fly though the air in their "default stance" pose. 

It's as if the animation gets cancelled, or the frog thinks it has landed on the ground while it is still in the air.

Edit: It also seems it could be an issue involving the frogs jumping at the same time as turning to face another direction, cancelling the jump animation

How to Reproduce:

1. Spawn a group of frogs and watch them jump.
2. Most use their jumping animation, however, sometimes you will notice the animation ends early
3. This will depict frogs jumping as if they had no special animation

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The image and videos below depict this described behavior. It may be hard to see at first because of the large amount of frogs.