Their spawn commands are:

gmsummon "shoulderdragon_character_bp_summer_c" 150

gmsummon "shoulderdragon_character_bp_autumn_c" 150

gmsummon "shoulderdragon_character_bp_winter_c" 150

gmsummon "shoulderdragon_character_bp_spring_c" 150

The 150 can be any number, this indicates the lvl before taming. The only difference between each command is literally just the name of the season. You're welcome. Idk why the youtubers don't put this stuff up first thing.