I am trying to beat 3 trolls, it is hard as they keep beating all my pets, I am level 45 and they are level 30

Hi, one issue I immediately saw concerning your party(All the blue names are clickable links leading to each pet's proficiency point page) Rosso Vargas, Melody Ledimirova, and Grimreaper666, is that despite each pet being above level 30(One being 45, 35, and 34), none of them have been assigned their second proficiency point.
Assigning those proficiency points is very much needed, it'll help to significantly strengthen your pets in battle. If I remember correctly, you get a free point at level 0, then earn more at levels 30, 60, 65, 70, and 75. giving you a total of six proficiency points per pet once you hit max level.

Another issue I saw with your team is that only Rosso Vargas has gear. Neither Melody nor Grimreaper has any gear on them.
Having gear on all your pets is needed to improve their stats. Make sure that the gear you put on your pets matches your pets' stats based on their element, as well as based on their levels.
Maybe look in your equipment inventory and check by rarity and level(Hover your mouse over the gear, or if you're on mobile/touchscreen, click it to see stats), to see which gear pieces have the highest stats needed for your pets, and place that gear on your pets.
I'd also suggest your gear be Epic rarity(Purple border in Inventory), and above if that's an option for you.
I'm not the best at explaining gear, so I'd suggest looking here at this guide, Equipment Guide as a reference to better understand pet gear and what's available for your pets.

If you're in need of gear, you can buy gear here on the Tradebroker and search by rarity, level, and name based on the gear you need.

I hope this helps at least a little bit and assists you in beating the trolls! ^^

Thank you, that helps alot

You're welcome, I'm glad I could help. ^^

Oh, a little tip, to let someone know that you replied to them, hit the @ at the bottom of their post/reply. It'll notify them that you replied to them by pinging them.

Oh, thank you for the tip ^^

You're welcome. ^^

I beat the trolls finally

That's great, congrats on beating the trolls! ^^