When I first started this game, I thought まいまい (the snail) was the only friend that would visit. I never knew the number of いっぴん your frog has collected from its journeys limits the friend who visits.
0 いっぴん - まいまい (Snail)
3 いっぴん onwards - ぶんぶん (Bee)
6 いっぴん onwards - ぷかぷか (Tortoise)
3 いっぴん onwards - ぶんぶん (Bee)
6 いっぴん onwards - ぷかぷか (Tortoise)