Hey guys! I just got a Snowloon, and im trying to train it for the trials. Do you have any tips on how to level up a companion quickly? Thank you!

Best thing to do is bring it with you into the campaign, and play with it consistently. Multiple copies will level faster if you play with them, since each will give the exp, but it goes to the level.

The method I use is campaign. I equip them to a lvl10 wolf, and choose another lvl10 wolf/companion pair to add to the crew. With two wolves & companions you have more of a chance to win the battles and give you xp. I used to always go to Goldsea area 4, but with the event going on now the best leveling area seems to be icerun area 3 (sword 2). You will likely always win the battle with the lapistrix, and still have a decent chance to beat the seasonal enderling battles (rewards 5xp each won battle) especially as your companion levels up. Don't worry about losing the enderling battle, the xp from the lapistrix (3xp each won battle) builds up quickly and you'll start beating the enderlings and after a bit of a grind, you'll have it finished :)
Be sure to refresh through each battle if you don't do that already, it cuts down a ton of time! This should take you less than an hour to finish for sure, maybe less than 30 mins depending on how you play
Edited to add, this way does take lots of stamina so I could be wrong on how long it can take. If you need some stam, I could gift you a stack of raw fish to cook up!

The method I use is campaign. I equip them to a lvl10 wolf, and choose another lvl10 wolf/companion pair to add to the crew. With two wolves & companions you have more of a chance to win the battles and give you xp. I used to always go to Goldsea area 4, but with the event going on now the best leveling area seems to be icerun area 3 (sword 2). You will likely always win the battle with the lapistrix, and still have a decent chance to beat the seasonal enderling battles (rewards 5xp each won battle) especially as your companion levels up. Don't worry about losing the enderling battle, the xp from the lapistrix (3xp each won battle) builds up quickly and you'll start beating the enderlings and after a bit of a grind, you'll have it finished :)
Be sure to refresh through each battle if you don't do that already, it cuts down a ton of time! This should take you less than an hour to finish for sure, maybe less than 30 mins depending on how you play
Edited to add, this way does take lots of stamina so I could be wrong on how long it can take. If you need some stam, I could gift you a stack of raw fish to cook up!

That would be great (and much appreciated) if you have the fish to spare! :oh I'm not doing poorly with stamina, but the boost would certainly not hurt! I would offer to pay, but I am currently saving up for the premium tier. Thank you so very much!~

I got my Snowloons, both standard colors singular copy, up from level 2 to level 10 in around 2-3 days from campaigning when going through the tasks as they appeared. The key is to not play with them in your wolf's profile so you can really swap them after 15 minutes to save some food here and there (remove them as companions when paying Nana). I added one Zerda without a companion to get the synergy (so switching between different Zerdas when possible) and for the 2 attaching the snowloons, as long as they have at least some level, any did the job.

Interesting. Where did you train? Icerun 3?

I got my Snowloons, both standard colors singular copy, up from level 2 to level 10 in around 2-3 days from campaigning when going through the tasks as they appeared. The key is to not play with them in your wolf's profile so you can really swap them after 15 minutes to save some food here and there (remove them as companions when paying Nana). I added one Zerda without a companion to get the synergy (so switching between different Zerdas when possible) and for the 2 attaching the snowloons, as long as they have at least some level, any did the job.

Interesting. Where did you train? Icerun 3?

I just went to Icerun 4, I beat the furmus most of times and it seems like the bosses now only need to be encountered to count toward the season quest. Might be more efficient to go to a lower level, but then again the +1 encounters are far more common anyway.