Oh I can give you good evidence that he may be.
In a new hope Luke is 19, in the last jedi he is 56. The child is 50 years old so he was born 6 years after luke. Yoda went into exile in revenge of the sith as Padme was pregnant. Meaning he had plenty of ¨free time¨ to have a child and a family. Also, its not like you see an abundance of yodas species, so the child may be the last of his kind or as I hope this hapens, Mando may find a tribe of yodas kind and it will be amazing.
Caption this Meme
