@Anagnos Good point. At least the crabs contributed to a story, and considering that the story revolved around them basically being vermin, it would've been impossible to tell that particular story with any type of dinosaurs in their place.
@Gentle Sharptooth Heh, I don't even remember when Spike licks him.

I just remember then scene when Ducky names him Tickles, plus another scene where he makes Ichy bite Dil's tail.
Is it wrong for me to be okay with the non-dinosaur characters of TLBT? I liked Tickles despite him being there just to be cute. XD Will say why I think the Ichy and Dile duo are interesting... I don't see them as much as a threat as a Sharptooth. If Ichy was working with Sharpteeth, it be pretty horrifying as hiding would be much more difficult. Also my favorite mammals of the franchise? The ones that thought Spike is some kind of deity in the TV show. XD
Worry not, there is no rule that says you aren't allowed to like non-dinosaurs.

I'm not even saying I ever
disliked Tickles, I just barely took note of him...

Anyway, I think I recall him being in there for more than just being cute. Didn't he help the Gang find their way through the Land of Mists? (Correct me if I'm wrong, that particular LBT movie isn't one of the ones I've watched more recently.)
I will admit that the three underground mammals are among my very least favorite characters in LBT.