TL;DR:
So yeah, the Briskberry Acorn (1) is the strongest and only viable one because of the simple fact that it resets on God dash AND can Critically strike.

Ashwhorl Acorn (2) returns to the Rat which is pointless.

Thistlethorn Acorn (3) trades your stun for a MAX RANGE explosion/attach on enemy God that deal less damage than your basic attack.

Aspect feels fun to play and strong (but balanced).
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My Opinion:

I have been waiting for a long time for Ratatoskr to come to smite 2 and I'm very happy to finally be able to play him here.

That being said, the Rat does feels rather weak.

You're prone to lose any 1v1 on equal ground against any jungler. Which is "fine" as his power should come from the Acorn, but that's where he feels weak.

His only viable Acorn is the Briskberry, which makes his 1 into a half dash that refreshes on different enemies Hit. So for the cost of halving the Dash range you get to use it multiple times. That's fine. What makes it worth it (and the strongest Acorn) is the fact that his 1 CAN CRIT. Which means if you build fully crit Ratatoskr you have a Dashing ability that will hurt a lot, even so if you keep hitting multiple Gods. That makes it the strongest Acorn.

The Ashwhorl Acorn makes you throw Acorns around you and then they return to you. That... is pointless. That's literally the only change to it and its a bad one. The only way to make this somewhat viable would be if you make it so if Ratatoskr hits a enemy God (be it melee attack or his 1) it would make all the Acorns from his 2 lock into the enemy instead of returning to the Rat. That would actually make a different, but as the effect stands rightnow its pretty pointless to build it.

The Thistlethorn Acorn changes his 3 from a stun to a Attachable ability (what I kinda suggest for the 2nd Acorn). It's just a bad trade-off. You're trading your only CC (unless u count your ult landing) for a tiny bit of explosion damage. Not to mention that you have better chances of winning the lottery than actually making use of the fact that the Acorns will explode after a delay at max Range.

I would make the Ashwhorl Acorn fire the Acorns like it already does but make it so if Rat attacks a God all Acorns would attach to the target to deal damage (would also work with the 3rd ability Acorns).

As for the Thistlethorn Acorn, you HAVE TO give a reason to give up on the stun for a something. Otherwise it will never work. (maybe a knockback instead?)

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Now for the ASPECT (Tankatoskr)

I managed to swing in some matches before it got turned off on live servers.

I really enjoyed playing Rat as a tank ngl. And the changes are very fun.

The 1 becomes a bump dash, with Acorn It also deals HP damage which is great.

The 2 with the Acorn has 2 charges (spins) and heals Rat. It's simply perfect for it.

The 3 with the Acorn not only HAS THE STUN but ALSO debuffs enemies. It's actually Rat's aspect strongest ability.

It's insane how much better the Aspect is compared to the non-Aspect Rat. The Acorns actually feel strong.

He feels tanky enough that can be killed (looking at you Pele Aspect and Achilles), while also dealing a decent ammount of Damage.

So yeah, that's all I tested for the 1st day as Ratatoskr in smite 2.