Pokemon guinea pig. It may also be based on wordplay of the groundhog. For pokemon x on the 3ds a gamefaqs message board topic titled do we have a guinea pig pokemon. It could also possibly come from pika as it is the electric rodent pokemon of the region which originates from the concept of pikachu. The abilities it could have is static fur coat because of their tuffs of fur and maybe analytic since they can remember complex pathways and such.
Morpeko may be a combination of morph and harapeko which is japanese for hungry or starving. Tepig is a quadruped pig like pokemon that is primarily orange. Both are similar in characteristics and behavior while ground hog describes swinubs type and species quite well. Discussion and conceptualisation of the regional rodent began not long after the earliest confirmations or at least agreements on the starter pokemon designs.
Capig is based on a guinea pig. Pokemon that resemble pigs. Guinea pigs arent fast so they would lose speed but they are aggressive so i think it would excel in physical attack and decent special attack. Swinub also resembles the marsupial mole.
Its fur pattern is reminiscent of a chullo an andean style of hat.