Q1: Can a figure retrieve more than one token if the scenario rules don't specifically prohibit it? One page 22 of the Rules Reference it says:

"If a figure is defeated, any tokens that it is carrying are dropped in its space."

The fact that it says "a figure" (singular) and "any tokens" (plural) seems to suggest that a figure can carry multiple tokens but I don't want to assume the prose wasn't just talking in general terms as opposed to being specifically plural in reference to the dropped token(s).

Q2: If Beast Tamer is used to allow a non-sentient figure to perform an interact and that figure then retrieves a token, is that figure allowed to keep carrying the token after the activation in which Beast Tamer was used ends?

I tend to think that it would be able to continue carrying the token, The RR doesn't have an entry for "carry" that clarifies whether being able to interact is a condition for being able to carry a token. Also, if the non-sentient figure weren't allowed to keep carrying the token at the end of the activation in which Beast Tamer was used I'd wonder where the token would be placed.

A1) Yes, a figure can retrieve multiple tokens unless mission rules prohibit it.

A2) Yes, the figure can continue to carry the token, even if beast tamer was used to allow a temporary interact.

A2) Yes, because retrieving a token is an interact (which non-sentient figures without a Beast Tamer cannot perform), but holding a token is not an interact and therefore no problem for non-sentient figures.

A2) Yes, because retrieving a token is an interact (which non-sentient figures without a Beast Tamer cannot perform), but holding a token is not an interact and therefore no problem for non-sentient figures.

1) Yes, unless mission rules restrict it, a figure can be carrying more than one token or object.

2) A figure cannot voluntarily drop tokens/objects it is carrying. Unless the mission rules says otherwise, a figure carries tokens/objects until being defeated.

Retrieve needs an interact unless a mission rule says otherwise (see Retrieve and Interact from RRG), whether that interact is from an Interact action or from performing an interact without an action.

Note that Non-Sentient does not disallow the Interact action, it disallows performing an interact.