Sherbet, Pistachio, and Bubble Gum flavoured Taffy Slugs!
They're $8 USD
Pistachio owned by: [open]
Bubble Gum owned by: [no longer available, but if you like the colours used in this one, I could do a completely new design with these colours]
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Feeding them sugar increases their size, while sprinkling them with salt shrinks them down.
They're semi-amorphous and are capable of slipping through small cracks and regenerating any lost limbs.
Reference for minimum and maximum size.
Here is a bigger version if you'd like to get a better look at them!
Link
TCgamerboy2002
I'll take the one on the left, please. =)