Trophy Frogs

Trophy Frogs are the Lotus Atoll's version of trophy fish: special catches while fishing there, each with its own condition (shown with each frog below) and each in four tiers, Bronze, Silver, Gold and Diamond.¹ You can donate them to Researcher Ribery for Lotus, and Ribery also rewards you for the tiers you collect.¹

How a catch is decided

It works like Trophy Fishing: every frog whose condition you meet is rolled, and if none hits you get normal fishing loot. The tier is then rolled from Diamond (0.2%) through Gold (2%) and Silver (25%) down to Bronze; the Charm enchantment raises the first three.¹ Trophy Fish Chance makes frogs more likely overall.¹

Pity: if you haven't caught a frog's Gold or Diamond tier yet, your 101st catch of it is Gold and your 601st is Diamond. The Exploding Frog and Puddle Jumper get there sooner, at the 51st and 301st catch.¹

Rewards

Donations to Researcher Ribery for Lotus, and his rewards for each tier collected.¹
Gold and Diamond frogs give 15 and 30 Bits, raised by your Bits multiplier.¹
The first Bronze, Silver, Gold and Diamond of each frog give 3, 6, 12 and 24 SkyBlock XP; a higher tier also pays out the lower ones.¹
Bronze and Silver frogs can be fed to Tewtils, which explode and drop rewards.¹