"Well, now there’s a mod for that."
The following is unofficial/fan-made content.
Splunkins are a custom enemy made by Alesan99 for his second enemy pack Alesan's Enemies, and returned as a standard Mari0 enemy in Alesan's Entities. The enemy is based on the Splunkin enemy from New Super Mario Bros.
In-Game (Custom Enemy)[]
Upon placing one in a mappack, Splunkins behave almost identically to Goombas. The only difference is that they transform into the "splunkinmad" enemy after being stomped. Splunkinmad runs at twice the speed of a normal Splunkin. Stomping on Splunkinmad will kill it, similar to regular Goombas.
In Alesan's Entities (v3.02 to v12.1C)[]
In Mari0 AE, Splunkins act almost identical to the custom enemy, the only difference being that the custom enemy uses 2 images, while the AE Splukin uses only 1 image.
In Alesan's Entities (v13)[]
In AE v13, new sprites were made for the Splunkins, the creator of them being SubPixuru, (his name on the Stabyourself.net forums) or SubPixelGamer. (current name on Discord) The Splunkins now use 2 seperate frames for walking rather than 1 being flipped, (like a Goomba) and because of that, Custom Graphics that used the old Splunkin image are now broken.