Exactly. Although Handsy Moose has the superior design (all those waving hands, so pretty), Leaftroll had a huge impact on the story.
They survived the punch-fest of Lalli's luonto. They then schlepped along using the snow as a sunshield, and took their opportunity to bite Reynir Sigrun, thus wounding her arm. As if that wasn't bad enough, they crawled within reach of the ghosts within the palace, lending the ghost that became Sleipnope its first acquisition of energy. That's a lot of plot to set in motion for one little troll.