Chespin - likely Chesnut + Spine, fully evolved I'm picturing a Grass/Dark Sandslash-esque pokemon, which can curl up in to a ball, and look like the casing to a conker/horse chesnut, I.e, green and spiny.
Fennekin - Fennic fox + kin (possibly kin as is child, etc), kindle also works.
Froakie - Foam/Frog + Croak, 'oakie' is also an inexperienced person, like a rookie. Fightning type connotations.
I'm fully expecting Grass/Dark, Fire/Psychic and Water/Fighting, from the names and second moves shown.
GT: Corrupted177 - Play Halo Reach, Dark Souls, Armored Core V, Borderlands GOTY and Dragon's Dogma. NNID: NightWatchman177 - Play Nintendoland and ZombiU.